57320661 has 8 divisors (see below), whose sum is σ = 76476064. Its totient is φ = 38189520.

The previous prime is 57320647. The next prime is 57320707. The reversal of 57320661 is 16602375.

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

It is not a de Polignac number, because 57320661 - 2⁶ = 57320597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57320611) 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, 450 + ... + 10716.

It is an arithmetic number, because the mean of its divisors is an integer number (9559508).

Almost surely, 2^57320661 is an apocalyptic number.

It is an amenable number.

57320661 is a deficient number, since it is larger than the sum of its proper divisors (19155403).

57320661 is a wasteful number, since it uses less digits than its factorization.

57320661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12131.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 57320661 is about 7571.0409456032. The cubic root of 57320661 is about 385.5704390321.

The spelling of 57320661 in words is "fifty-seven million, three hundred twenty thousand, six hundred sixty-one".