307686681 has 15 divisors (see below), whose sum is σ = 459866671. Its totient is φ = 205019208.

The previous prime is 307686667. The next prime is 307686737. The reversal of 307686681 is 186686703.

The square root of 307686681 is 17541.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 247779081 + 59907600 = 15741^2 + 7740^2 .

It is not a de Polignac number, because 307686681 - 2¹⁹ = 307162393 is a prime.

It is a super-2 number, since 2×307686681² = 189342187329591522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (307686611) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 156895 + ... + 158843.

Almost surely, 2^307686681 is an apocalyptic number.

307686681 is the 17541-st square number.

307686681 is the 8771-st centered octagonal number.

It is an amenable number.

307686681 is a deficient number, since it is larger than the sum of its proper divisors (152179990).

307686681 is an frugal number, since it uses more digits than its factorization.

307686681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910 (or 1952 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The cubic root of 307686681 is about 675.1022659869.

The spelling of 307686681 in words is "three hundred seven million, six hundred eighty-six thousand, six hundred eighty-one".