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644097076 = 227291914153
BaseRepresentation
bin100110011001000…
…010010000110100
31122212222112002021
4212121002100310
52304342101301
6143525122524
721650510020
oct4631022064
91585875067
10644097076
11300637737
1215b859444
13a359823c
1461785380
153b82d8a1
hex26642434

644097076 has 48 divisors (see below), whose sum is σ = 1339914240. Its totient is φ = 265063680.

The previous prime is 644097061. The next prime is 644097089. The reversal of 644097076 is 670790446.

It is a super-2 number, since 2×6440970762 = 829722086623499552, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153016 + ... + 157168.

It is an arithmetic number, because the mean of its divisors is an integer number (27914880).

Almost surely, 2644097076 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644097076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (669957120).

644097076 is an abundant number, since it is smaller than the sum of its proper divisors (695817164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644097076 is a wasteful number, since it uses less digits than its factorization.

644097076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4384 (or 4382 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 644097076 is about 25379.0676739710. The cubic root of 644097076 is about 863.6088997079.

The spelling of 644097076 in words is "six hundred forty-four million, ninety-seven thousand, seventy-six".

Divisors: 1 2 4 7 14 28 29 58 116 191 203 382 406 764 812 1337 2674 4153 5348 5539 8306 11078 16612 22156 29071 38773 58142 77546 116284 120437 155092 240874 481748 793223 843059 1586446 1686118 3172892 3372236 5552561 11105122 22210244 23003467 46006934 92013868 161024269 322048538 644097076