51157040 has 80 divisors (see below), whose sum is σ = 132018336. Its totient is φ = 18278400.

The previous prime is 51157019. The next prime is 51157049. The reversal of 51157040 is 4075115.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 51156997 and 51157015.

It is not an unprimeable number, because it can be changed into a prime (51157049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53204 + ... + 54156.

Almost surely, 2^51157040 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 51157040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66009168).

51157040 is an abundant number, since it is smaller than the sum of its proper divisors (80861296).

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

51157040 is a wasteful number, since it uses less digits than its factorization.

51157040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038 (or 1032 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 51157040 is about 7152.4149767753. The cubic root of 51157040 is about 371.2232220782.

The spelling of 51157040 in words is "fifty-one million, one hundred fifty-seven thousand, forty".