57640807 has 10 divisors (see below), whose sum is σ = 67246408. Its totient is φ = 49404348.

The previous prime is 57640787. The next prime is 57640831. The reversal of 57640807 is 70804675.

It is a happy number.

It is not a de Polignac number, because 57640807 - 2¹⁹ = 57116519 is a prime.

It is a super-2 number, since 2×57640807² = 6644925263222498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57640867) 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, 9603 + ... + 14404.

Almost surely, 2^57640807 is an apocalyptic number.

57640807 is the 4802-nd heptagonal number.

57640807 is a deficient number, since it is larger than the sum of its proper divisors (9605601).

57640807 is an frugal number, since it uses more digits than its factorization.

57640807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24035 (or 24014 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 57640807 is about 7592.1543055973. The cubic root of 57640807 is about 386.2869330666.

The spelling of 57640807 in words is "fifty-seven million, six hundred forty thousand, eight hundred seven".