51457920 has 64 divisors (see below), whose sum is σ = 164028240. Its totient is φ = 13721600.

The previous prime is 51457907. The next prime is 51457921. The reversal of 51457920 is 2975415.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51457921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11481 + ... + 15320.

Almost surely, 2^51457920 is an apocalyptic number.

It is an amenable number.

51457920 is an abundant number, since it is smaller than the sum of its proper divisors (112570320).

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

51457920 is a wasteful number, since it uses less digits than its factorization.

51457920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26823 (or 26811 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 51457920 is about 7173.4175955398. The cubic root of 51457920 is about 371.9495827152.

The spelling of 51457920 in words is "fifty-one million, four hundred fifty-seven thousand, nine hundred twenty".