680865731 has 24 divisors (see below), whose sum is σ = 856477440. Its totient is φ = 536481792.

The previous prime is 680865707. The next prime is 680865737. The reversal of 680865731 is 137568086.

680865731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 680865731 - 2¹⁴ = 680849347 is a prime.

It is a super-2 number, since 2×680865731² = 927156287300328722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (680865737) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161630 + ... + 165788.

It is an arithmetic number, because the mean of its divisors is an integer number (35686560).

Almost surely, 2^680865731 is an apocalyptic number.

680865731 is a deficient number, since it is larger than the sum of its proper divisors (175611709).

680865731 is a wasteful number, since it uses less digits than its factorization.

680865731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4443 (or 4436 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 680865731 is about 26093.4039749512. The cubic root of 680865731 is about 879.7389596775.

The spelling of 680865731 in words is "six hundred eighty million, eight hundred sixty-five thousand, seven hundred thirty-one".