57438721 has 8 divisors (see below), whose sum is σ = 58018688. Its totient is φ = 56862000.

The previous prime is 57438707. The next prime is 57438737. The reversal of 57438721 is 12783475.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57438721 - 2⁷ = 57438593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57438791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48466 + ... + 49636.

It is an arithmetic number, because the mean of its divisors is an integer number (7252336).

Almost surely, 2^57438721 is an apocalyptic number.

It is an amenable number.

57438721 is a deficient number, since it is larger than the sum of its proper divisors (579967).

57438721 is a wasteful number, since it uses less digits than its factorization.

57438721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623.

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

The square root of 57438721 is about 7578.8337493311. The cubic root of 57438721 is about 385.8349697674.

The spelling of 57438721 in words is "fifty-seven million, four hundred thirty-eight thousand, seven hundred twenty-one".