57656691 has 10 divisors (see below), whose sum is σ = 86129252. Its totient is φ = 38437740.

The previous prime is 57656689. The next prime is 57656717. The reversal of 57656691 is 19665675.

It is not a de Polignac number, because 57656691 - 2¹ = 57656689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57656671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 355825 + ... + 355986.

Almost surely, 2^57656691 is an apocalyptic number.

57656691 is a deficient number, since it is larger than the sum of its proper divisors (28472561).

57656691 is an equidigital number, since it uses as much as digits as its factorization.

57656691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711823 (or 711814 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 57656691 is about 7593.2003134383. The cubic root of 57656691 is about 386.3224126654.

The spelling of 57656691 in words is "fifty-seven million, six hundred fifty-six thousand, six hundred ninety-one".