51327811840 has 72 divisors (see below), whose sum is σ = 125266053528. Its totient is φ = 20143718400.

The previous prime is 51327811789. The next prime is 51327811861. The reversal of 51327811840 is 4811872315.

It can be written as a sum of positive squares in 4 ways, for example, as 17348050944 + 33979760896 = 131712^2 + 184336^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 51327811793 and 51327811802.

It is an unprimeable number.

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, 310461 + ... + 446140.

It is an arithmetic number, because the mean of its divisors is an integer number (1739806299).

Almost surely, 2^51327811840 is an apocalyptic number.

It is an amenable number.

51327811840 is an abundant number, since it is smaller than the sum of its proper divisors (73938241688).

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

51327811840 is an equidigital number, since it uses as much as digits as its factorization.

51327811840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756675 (or 756661 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 51327811840 in words is "fifty-one billion, three hundred twenty-seven million, eight hundred eleven thousand, eight hundred forty".