57220736 has 32 divisors (see below), whose sum is σ = 114377700. Its totient is φ = 28514304.

The previous prime is 57220697. The next prime is 57220753. The reversal of 57220736 is 63702275.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 40246336 + 16974400 = 6344^2 + 4120^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 51806 + ... + 52898.

Almost surely, 2^57220736 is an apocalyptic number.

It is an amenable number.

57220736 is a deficient number, since it is larger than the sum of its proper divisors (57156964).

57220736 is a wasteful number, since it uses less digits than its factorization.

57220736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516 (or 1504 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 57220736 is about 7564.4389084717. The cubic root of 57220736 is about 385.3462584581.

The spelling of 57220736 in words is "fifty-seven million, two hundred twenty thousand, seven hundred thirty-six".