979128687820 has 24 divisors (see below), whose sum is σ = 2062867880304. Its totient is φ = 390375734976.

The previous prime is 979128687767. The next prime is 979128687847. The reversal of 979128687820 is 28786821979.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79727467 + ... + 79739746.

It is an arithmetic number, because the mean of its divisors is an integer number (85952828346).

Almost surely, 2^979128687820 is an apocalyptic number.

It is an amenable number.

979128687820 is an abundant number, since it is smaller than the sum of its proper divisors (1083739192484).

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

979128687820 is a wasteful number, since it uses less digits than its factorization.

979128687820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159467529 (or 159467527 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 67.

The spelling of 979128687820 in words is "nine hundred seventy-nine billion, one hundred twenty-eight million, six hundred eighty-seven thousand, eight hundred twenty".