57407521 has 12 divisors (see below), whose sum is σ = 61620588. Its totient is φ = 53294592.

The previous prime is 57407513. The next prime is 57407549. The reversal of 57407521 is 12570475.

It can be written as a sum of positive squares in 6 ways, for example, as 26896 + 57380625 = 164^2 + 7575^2 .

It is not a de Polignac number, because 57407521 - 2³ = 57407513 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 (57407621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 365575 + ... + 365731.

It is an arithmetic number, because the mean of its divisors is an integer number (5135049).

Almost surely, 2^57407521 is an apocalyptic number.

It is an amenable number.

57407521 is a deficient number, since it is larger than the sum of its proper divisors (4213067).

57407521 is a wasteful number, since it uses less digits than its factorization.

57407521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 57407521 is about 7576.7751055446. The cubic root of 57407521 is about 385.7650968597.

Adding to 57407521 its reverse (12570475), we get a palindrome (69977996).

The spelling of 57407521 in words is "fifty-seven million, four hundred seven thousand, five hundred twenty-one".