57648921 has 16 divisors (see below), whose sum is σ = 88786368. Its totient is φ = 32883200.

The previous prime is 57648917. The next prime is 57648937. The reversal of 57648921 is 12984675.

It is a cyclic number.

It is not a de Polignac number, because 57648921 - 2² = 57648917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57648121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50820 + ... + 51941.

It is an arithmetic number, because the mean of its divisors is an integer number (5549148).

Almost surely, 2^57648921 is an apocalyptic number.

57648921 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

57648921 is a deficient number, since it is larger than the sum of its proper divisors (31137447).

57648921 is a wasteful number, since it uses less digits than its factorization.

57648921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102792.

The product of its digits is 120960, while the sum is 42.

The square root of 57648921 is about 7592.6886542252. The cubic root of 57648921 is about 386.3050578713.

The spelling of 57648921 in words is "fifty-seven million, six hundred forty-eight thousand, nine hundred twenty-one".