51158520 has 256 divisors, whose sum is σ = 199756800. Its totient is φ = 11404800.

The previous prime is 51158501. The next prime is 51158537. The reversal of 51158520 is 2585115.

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 63 ways as a sum of consecutive naturals, for example, 506470 + ... + 506570.

It is an arithmetic number, because the mean of its divisors is an integer number (780300).

Almost surely, 2^51158520 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 51158520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99878400).

51158520 is an abundant number, since it is smaller than the sum of its proper divisors (148598280).

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

51158520 is a wasteful number, since it uses less digits than its factorization.

51158520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 51158520 is about 7152.5184375855. The cubic root of 51158520 is about 371.2268019379.

The spelling of 51158520 in words is "fifty-one million, one hundred fifty-eight thousand, five hundred twenty".