57640881 has 4 divisors (see below), whose sum is σ = 76854512. Its totient is φ = 38427252.

The previous prime is 57640871. The next prime is 57640901. The reversal of 57640881 is 18804675.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 57640881 - 2¹⁵ = 57608113 is a prime.

It is a super-2 number, since 2×57640881² = 6644942324912322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57640831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9606811 + ... + 9606816.

It is an arithmetic number, because the mean of its divisors is an integer number (19213628).

Almost surely, 2^57640881 is an apocalyptic number.

It is an amenable number.

57640881 is a deficient number, since it is larger than the sum of its proper divisors (19213631).

57640881 is a wasteful number, since it uses less digits than its factorization.

57640881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19213630.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 57640881 is about 7592.1591790478. The cubic root of 57640881 is about 386.2870983732.

The spelling of 57640881 in words is "fifty-seven million, six hundred forty thousand, eight hundred eighty-one".