57640831 has 2 divisors, whose sum is σ = 57640832. Its totient is φ = 57640830.

The previous prime is 57640787. The next prime is 57640841. The reversal of 57640831 is 13804675.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57640831 - 2¹¹ = 57638783 is a prime.

It is a super-2 number, since 2×57640831² = 6644930796741122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57640841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28820415 + 28820416.

It is an arithmetic number, because the mean of its divisors is an integer number (28820416).

Almost surely, 2^57640831 is an apocalyptic number.

57640831 is a deficient number, since it is larger than the sum of its proper divisors (1).

57640831 is an equidigital number, since it uses as much as digits as its factorization.

57640831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 57640831 is about 7592.1558861762. The cubic root of 57640831 is about 386.2869866795.

The spelling of 57640831 in words is "fifty-seven million, six hundred forty thousand, eight hundred thirty-one".