57553721 has 8 divisors (see below), whose sum is σ = 61009920. Its totient is φ = 54105408.

The previous prime is 57553703. The next prime is 57553723. The reversal of 57553721 is 12735575.

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 57553721 - 2¹⁰ = 57552697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57553723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20420 + ... + 23066.

It is an arithmetic number, because the mean of its divisors is an integer number (7626240).

Almost surely, 2^57553721 is an apocalyptic number.

It is an amenable number.

57553721 is a deficient number, since it is larger than the sum of its proper divisors (3456199).

57553721 is a wasteful number, since it uses less digits than its factorization.

57553721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3943.

The product of its digits is 36750, while the sum is 35.

The square root of 57553721 is about 7586.4168749153. The cubic root of 57553721 is about 386.0922958441.

The spelling of 57553721 in words is "fifty-seven million, five hundred fifty-three thousand, seven hundred twenty-one".