51978530860 has 24 divisors (see below), whose sum is σ = 109163980800. Its totient is φ = 20789685504.

The previous prime is 51978530833. The next prime is 51978530861. The reversal of 51978530860 is 6803587915.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 51978530798 and 51978530807.

It is not an unprimeable number, because it can be changed into a prime (51978530861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154452 + ... + 357508.

It is an arithmetic number, because the mean of its divisors is an integer number (4548499200).

Almost surely, 2^51978530860 is an apocalyptic number.

It is an amenable number.

51978530860 is an abundant number, since it is smaller than the sum of its proper divisors (57185449940).

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

51978530860 is a wasteful number, since it uses less digits than its factorization.

51978530860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215865 (or 215863 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 51978530860 in words is "fifty-one billion, nine hundred seventy-eight million, five hundred thirty thousand, eight hundred sixty".