51255920 has 40 divisors (see below), whose sum is σ = 125445840. Its totient is φ = 19422720.

The previous prime is 51255913. The next prime is 51255931. The reversal of 51255920 is 2955215.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 15341 + ... + 18380.

It is an arithmetic number, because the mean of its divisors is an integer number (3136146).

Almost surely, 2^51255920 is an apocalyptic number.

It is an amenable number.

51255920 is an abundant number, since it is smaller than the sum of its proper divisors (74189920).

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

51255920 is a wasteful number, since it uses less digits than its factorization.

51255920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33753 (or 33747 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 51255920 is about 7159.3239904337. The cubic root of 51255920 is about 371.4622437774.

The spelling of 51255920 in words is "fifty-one million, two hundred fifty-five thousand, nine hundred twenty".