57249665 has 16 divisors (see below), whose sum is σ = 75854016. Its totient is φ = 41131200.

The previous prime is 57249649. The next prime is 57249671. The reversal of 57249665 is 56694275.

57249665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 57249665 - 2⁴ = 57249649 is a prime.

It is a super-2 number, since 2×57249665² = 6555048285224450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1706 + ... + 10835.

It is an arithmetic number, because the mean of its divisors is an integer number (4740876).

Almost surely, 2^57249665 is an apocalyptic number.

57249665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

57249665 is a deficient number, since it is larger than the sum of its proper divisors (18604351).

57249665 is a wasteful number, since it uses less digits than its factorization.

57249665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12640.

The product of its digits is 453600, while the sum is 44.

The square root of 57249665 is about 7566.3508377553. The cubic root of 57249665 is about 385.4111871569.

The spelling of 57249665 in words is "fifty-seven million, two hundred forty-nine thousand, six hundred sixty-five".