51257560 has 16 divisors (see below), whose sum is σ = 115329600. Its totient is φ = 20503008.

The previous prime is 51257509. The next prime is 51257561. The reversal of 51257560 is 6575215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51257561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640680 + ... + 640759.

It is an arithmetic number, because the mean of its divisors is an integer number (7208100).

Almost surely, 2^51257560 is an apocalyptic number.

It is an amenable number.

51257560 is an abundant number, since it is smaller than the sum of its proper divisors (64072040).

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

51257560 is a wasteful number, since it uses less digits than its factorization.

51257560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281450 (or 1281446 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 51257560 is about 7159.4385254711. The cubic root of 51257560 is about 371.4662055414.

The spelling of 51257560 in words is "fifty-one million, two hundred fifty-seven thousand, five hundred sixty".