680739261 has 32 divisors (see below), whose sum is σ = 961486848. Its totient is φ = 427801920.

The previous prime is 680739251. The next prime is 680739281. The reversal of 680739261 is 162937086.

It is a happy number.

It is not a de Polignac number, because 680739261 - 2⁷ = 680739133 is a prime.

It is a super-2 number, since 2×680739261² = 926811882933652242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680739251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 822730 + ... + 823556.

It is an arithmetic number, because the mean of its divisors is an integer number (30046464).

Almost surely, 2^680739261 is an apocalyptic number.

It is an amenable number.

680739261 is a deficient number, since it is larger than the sum of its proper divisors (280747587).

680739261 is a wasteful number, since it uses less digits than its factorization.

680739261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 680739261 is about 26090.9804530225. The cubic root of 680739261 is about 879.6844861493.

The spelling of 680739261 in words is "six hundred eighty million, seven hundred thirty-nine thousand, two hundred sixty-one".