57320281 has 4 divisors (see below), whose sum is σ = 57378100. Its totient is φ = 57262464.

The previous prime is 57320251. The next prime is 57320287. The reversal of 57320281 is 18202375.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5480281 + 51840000 = 2341^2 + 7200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57320281 is a prime.

It is a super-2 number, since 2×57320281² = 6571229227837922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57320287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27396 + ... + 29413.

It is an arithmetic number, because the mean of its divisors is an integer number (14344525).

Almost surely, 2^57320281 is an apocalyptic number.

It is an amenable number.

57320281 is a deficient number, since it is larger than the sum of its proper divisors (57819).

57320281 is a wasteful number, since it uses less digits than its factorization.

57320281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57818.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 57320281 is about 7571.0158499372. The cubic root of 57320281 is about 385.5695870002.

The spelling of 57320281 in words is "fifty-seven million, three hundred twenty thousand, two hundred eighty-one".