51136920 has 96 divisors (see below), whose sum is σ = 172383120. Its totient is φ = 13633920.

The previous prime is 51136919. The next prime is 51136951. The reversal of 51136920 is 2963115.

It is a super-2 number, since 2×51136920² = 5229969174172800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7090 + ... + 12350.

Almost surely, 2^51136920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51136920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86191560).

51136920 is an abundant number, since it is smaller than the sum of its proper divisors (121246200).

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

51136920 is a wasteful number, since it uses less digits than its factorization.

51136920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5287 (or 5271 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 51136920 is about 7151.0083205098. The cubic root of 51136920 is about 371.1745484866.

The spelling of 51136920 in words is "fifty-one million, one hundred thirty-six thousand, nine hundred twenty".