57123540 has 36 divisors (see below), whose sum is σ = 173275284. Its totient is φ = 15232896.

The previous prime is 57123529. The next prime is 57123541. The reversal of 57123540 is 4532175.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10419984 + 46703556 = 3228^2 + 6834^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57123541) 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, 158497 + ... + 158856.

Almost surely, 2^57123540 is an apocalyptic number.

It is an amenable number.

57123540 is an abundant number, since it is smaller than the sum of its proper divisors (116151744).

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

57123540 is a wasteful number, since it uses less digits than its factorization.

57123540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317368 (or 317363 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 57123540 is about 7558.0116432829. The cubic root of 57123540 is about 385.1279498268.

The spelling of 57123540 in words is "fifty-seven million, one hundred twenty-three thousand, five hundred forty".