51076681920 has 560 divisors, whose sum is σ = 199156320000. Its totient is φ = 12322990080.

The previous prime is 51076681879. The next prime is 51076681933. The reversal of 51076681920 is 2918667015.

51076681920 is a `hidden beast` number, since 510 + 76 + 68 + 1 + 9 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 102357831 + ... + 102358329.

Almost surely, 2^51076681920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51076681920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99578160000).

51076681920 is an abundant number, since it is smaller than the sum of its proper divisors (148079638080).

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

51076681920 is a wasteful number, since it uses less digits than its factorization.

51076681920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 51076681920 in words is "fifty-one billion, seventy-six million, six hundred eighty-one thousand, nine hundred twenty".