51400072840 has 16 divisors (see below), whose sum is σ = 115650163980. Its totient is φ = 20560029120.

The previous prime is 51400072831. The next prime is 51400072861. The reversal of 51400072840 is 4827000415.

It can be written as a sum of positive squares in 2 ways, for example, as 44035343716 + 7364729124 = 209846^2 + 85818^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 642500871 + ... + 642500950.

Almost surely, 2^51400072840 is an apocalyptic number.

It is an amenable number.

51400072840 is an abundant number, since it is smaller than the sum of its proper divisors (64250091140).

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

51400072840 is a wasteful number, since it uses less digits than its factorization.

51400072840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285001832 (or 1285001828 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The spelling of 51400072840 in words is "fifty-one billion, four hundred million, seventy-two thousand, eight hundred forty".