979794398520 has 384 divisors, whose sum is σ = 3762579824640. Its totient is φ = 216385551360.

The previous prime is 979794398507. The next prime is 979794398573. The reversal of 979794398520 is 25893497979.

979794398520 is a `hidden beast` number, since 9 + 7 + 9 + 7 + 9 + 4 + 3 + 98 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 51002757 + ... + 51021963.

It is an arithmetic number, because the mean of its divisors is an integer number (9798384960).

Almost surely, 2^979794398520 is an apocalyptic number.

979794398520 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 979794398520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1881289912320).

979794398520 is an abundant number, since it is smaller than the sum of its proper divisors (2782785426120).

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

979794398520 is a wasteful number, since it uses less digits than its factorization.

979794398520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19915 (or 19908 counting only the distinct ones).

The product of its (nonzero) digits is 308629440, while the sum is 72.

The spelling of 979794398520 in words is "nine hundred seventy-nine billion, seven hundred ninety-four million, three hundred ninety-eight thousand, five hundred twenty".