57405220 has 24 divisors (see below), whose sum is σ = 120698424. Its totient is φ = 22934016.

The previous prime is 57405199. The next prime is 57405221. The reversal of 57405220 is 2250475.

It can be written as a sum of positive squares in 4 ways, for example, as 42536484 + 14868736 = 6522^2 + 3856^2 .

It is not an unprimeable number, because it can be changed into a prime (57405221) 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, 24834 + ... + 27046.

It is an arithmetic number, because the mean of its divisors is an integer number (5029101).

Almost surely, 2^57405220 is an apocalyptic number.

It is an amenable number.

57405220 is an abundant number, since it is smaller than the sum of its proper divisors (63293204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57405220 is a wasteful number, since it uses less digits than its factorization.

57405220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3519 (or 3517 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 57405220 is about 7576.6232584180. The cubic root of 57405220 is about 385.7599427304.

Adding to 57405220 its reverse (2250475), we get a palindrome (59655695).

The spelling of 57405220 in words is "fifty-seven million, four hundred five thousand, two hundred twenty".