51255520 has 48 divisors (see below), whose sum is σ = 121519440. Its totient is φ = 20429824.

The previous prime is 51255517. The next prime is 51255551. The reversal of 51255520 is 2555215.

It is a happy number.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89796 + ... + 90364.

It is an arithmetic number, because the mean of its divisors is an integer number (2531655).

Almost surely, 2^51255520 is an apocalyptic number.

It is an amenable number.

51255520 is an abundant number, since it is smaller than the sum of its proper divisors (70263920).

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

51255520 is a wasteful number, since it uses less digits than its factorization.

51255520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 51255520 is about 7159.2960547808. The cubic root of 51255520 is about 371.4612774807.

The spelling of 51255520 in words is "fifty-one million, two hundred fifty-five thousand, five hundred twenty".