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680817481 = 19399259
BaseRepresentation
bin101000100101000…
…111001101001001
31202110002010000021
4220211013031021
52343242124411
6151320140441
722604565421
oct5045071511
91673063007
10680817481
1131a338283
12170007721
13ab0840a6
14665c3481
153eb83a71
hex28947349

680817481 has 8 divisors (see below), whose sum is σ = 718642400. Its totient is φ = 644978484.

The previous prime is 680817463. The next prime is 680817493. The reversal of 680817481 is 184718086.

It is not a de Polignac number, because 680817481 - 223 = 672428873 is a prime.

It is a super-2 number, since 2×6808174812 = 927024884870370722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680817451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42771 + ... + 56488.

It is an arithmetic number, because the mean of its divisors is an integer number (89830300).

Almost surely, 2680817481 is an apocalyptic number.

680817481 is the 15065-th hex number.

It is an amenable number.

680817481 is a deficient number, since it is larger than the sum of its proper divisors (37824919).

680817481 is an frugal number, since it uses more digits than its factorization.

680817481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99316 (or 99278 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 680817481 is about 26092.4793954120. The cubic root of 680817481 is about 879.7181780923.

The spelling of 680817481 in words is "six hundred eighty million, eight hundred seventeen thousand, four hundred eighty-one".

Divisors: 1 19 361 6859 99259 1885921 35832499 680817481