57051920 has 20 divisors (see below), whose sum is σ = 132645900. Its totient is φ = 22820736.

The previous prime is 57051913. The next prime is 57051947. The reversal of 57051920 is 2915075.

It can be written as a sum of positive squares in 2 ways, for example, as 42823936 + 14227984 = 6544^2 + 3772^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 356495 + ... + 356654.

It is an arithmetic number, because the mean of its divisors is an integer number (6632295).

Almost surely, 2^57051920 is an apocalyptic number.

It is an amenable number.

57051920 is an abundant number, since it is smaller than the sum of its proper divisors (75593980).

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

57051920 is a wasteful number, since it uses less digits than its factorization.

57051920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713162 (or 713156 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 57051920 is about 7553.2721386165. The cubic root of 57051920 is about 384.9669280638.

Adding to 57051920 its reverse (2915075), we get a palindrome (59966995).

The spelling of 57051920 in words is "fifty-seven million, fifty-one thousand, nine hundred twenty".