51287776980 has 48 divisors (see below), whose sum is σ = 156660848064. Its totient is φ = 12433400320.

The previous prime is 51287776919. The next prime is 51287776987. The reversal of 51287776980 is 8967778215.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51287776987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38853717 + ... + 38855036.

It is an arithmetic number, because the mean of its divisors is an integer number (3263767668).

Almost surely, 2^51287776980 is an apocalyptic number.

It is an amenable number.

51287776980 is an abundant number, since it is smaller than the sum of its proper divisors (105373071084).

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

51287776980 is a wasteful number, since it uses less digits than its factorization.

51287776980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77708776 (or 77708774 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 60.

The spelling of 51287776980 in words is "fifty-one billion, two hundred eighty-seven million, seven hundred seventy-six thousand, nine hundred eighty".