51907140 has 72 divisors (see below), whose sum is σ = 160451928. Its totient is φ = 13578240.

The previous prime is 51907139. The next prime is 51907151. The reversal of 51907140 is 4170915.

51907140 is a `hidden beast` number, since 519 + 0 + 7 + 140 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14379264 + 37527876 = 3792^2 + 6126^2 .

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, 6820 + ... + 12260.

It is an arithmetic number, because the mean of its divisors is an integer number (2228499).

Almost surely, 2^51907140 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 51907140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80225964).

51907140 is an abundant number, since it is smaller than the sum of its proper divisors (108544788).

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

51907140 is a wasteful number, since it uses less digits than its factorization.

51907140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5509 (or 5504 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 51907140 is about 7204.6609913305. The cubic root of 51907140 is about 373.0288031770.

The spelling of 51907140 in words is "fifty-one million, nine hundred seven thousand, one hundred forty".