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640377 = 3271153
BaseRepresentation
bin10011100010101111001
31012112102200
42130111321
5130443002
621420413
75304663
oct2342571
91175380
10640377
113a8141
1226a709
1319562a
14129533
15c9b1c
hex9c579

640377 has 6 divisors (see below), whose sum is σ = 925002. Its totient is φ = 426912.

The previous prime is 640369. The next prime is 640411. The reversal of 640377 is 773046.

It can be written as a sum of positive squares in only one way, i.e., 389376 + 251001 = 624^2 + 501^2 .

It is not a de Polignac number, because 640377 - 23 = 640369 is a prime.

640377 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 640377.

It is not an unprimeable number, because it can be changed into a prime (640307) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 35568 + ... + 35585.

It is an arithmetic number, because the mean of its divisors is an integer number (154167).

2640377 is an apocalyptic number.

It is an amenable number.

640377 is a deficient number, since it is larger than the sum of its proper divisors (284625).

640377 is a wasteful number, since it uses less digits than its factorization.

640377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71159 (or 71156 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 640377 is about 800.2355903108. The cubic root of 640377 is about 86.1943055689.

The spelling of 640377 in words is "six hundred forty thousand, three hundred seventy-seven".

Divisors: 1 3 9 71153 213459 640377