51681880 has 32 divisors (see below), whose sum is σ = 117145440. Its totient is φ = 20519680.

The previous prime is 51681871. The next prime is 51681893. The reversal of 51681880 is 8818615.

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, 765 + ... + 10195.

It is an arithmetic number, because the mean of its divisors is an integer number (3660795).

Almost surely, 2^51681880 is an apocalyptic number.

It is an amenable number.

51681880 is an abundant number, since it is smaller than the sum of its proper divisors (65463560).

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

51681880 is a wasteful number, since it uses less digits than its factorization.

51681880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9579 (or 9575 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 51681880 is about 7189.0110585532. The cubic root of 51681880 is about 372.4884130744.

The spelling of 51681880 in words is "fifty-one million, six hundred eighty-one thousand, eight hundred eighty".