51865680 has 40 divisors (see below), whose sum is σ = 160784352. Its totient is φ = 13830784.

The previous prime is 51865679. The next prime is 51865703. The reversal of 51865680 is 8656815.

It is a tau number, because it is divible by the number of its divisors (40).

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, 107814 + ... + 108293.

Almost surely, 2^51865680 is an apocalyptic number.

It is an amenable number.

51865680 is an abundant number, since it is smaller than the sum of its proper divisors (108918672).

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

51865680 is a wasteful number, since it uses less digits than its factorization.

51865680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216123 (or 216117 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 51865680 is about 7201.7831125354. The cubic root of 51865680 is about 372.9294597874.

The spelling of 51865680 in words is "fifty-one million, eight hundred sixty-five thousand, six hundred eighty".