51680540 has 24 divisors (see below), whose sum is σ = 113248800. Its totient is φ = 19773248.

The previous prime is 51680521. The next prime is 51680557. The reversal of 51680540 is 4508615.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55715 + ... + 56634.

It is an arithmetic number, because the mean of its divisors is an integer number (4718700).

Almost surely, 2^51680540 is an apocalyptic number.

It is an amenable number.

51680540 is an abundant number, since it is smaller than the sum of its proper divisors (61568260).

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

51680540 is a wasteful number, since it uses less digits than its factorization.

51680540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112381 (or 112379 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 51680540 is about 7188.9178601511. The cubic root of 51680540 is about 372.4851937721.

The spelling of 51680540 in words is "fifty-one million, six hundred eighty thousand, five hundred forty".