51921302928 has 40 divisors (see below), whose sum is σ = 146323673376. Its totient is φ = 15733728000.

The previous prime is 51921302921. The next prime is 51921302929. The reversal of 51921302928 is 82920312915.

It is a super-2 number, since 2×51921302928² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51921302928.

It is not an unprimeable number, because it can be changed into a prime (51921302921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49167373 + ... + 49168428.

Almost surely, 2^51921302928 is an apocalyptic number.

It is an amenable number.

51921302928 is an abundant number, since it is smaller than the sum of its proper divisors (94402370448).

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

51921302928 is a wasteful number, since it uses less digits than its factorization.

51921302928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98335823 (or 98335817 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 51921302928 in words is "fifty-one billion, nine hundred twenty-one million, three hundred two thousand, nine hundred twenty-eight".