51502540 has 24 divisors (see below), whose sum is σ = 113848560. Its totient is φ = 19516608.

The previous prime is 51502513. The next prime is 51502541. The reversal of 51502540 is 4520515.

It is not an unprimeable number, because it can be changed into a prime (51502541) 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, 67387 + ... + 68146.

It is an arithmetic number, because the mean of its divisors is an integer number (4743690).

Almost surely, 2^51502540 is an apocalyptic number.

It is an amenable number.

51502540 is an abundant number, since it is smaller than the sum of its proper divisors (62346020).

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

51502540 is a wasteful number, since it uses less digits than its factorization.

51502540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135561 (or 135559 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 51502540 is about 7176.5270152073. The cubic root of 51502540 is about 372.0570595020.

The spelling of 51502540 in words is "fifty-one million, five hundred two thousand, five hundred forty".