79978898880 has 224 divisors, whose sum is σ = 291250298880. Its totient is φ = 20639646720.

The previous prime is 79978898807. The next prime is 79978898893. The reversal of 79978898880 is 8889887997.

It is a self number, because there is not a number n which added to its sum of digits gives 79978898880.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118537 + ... + 417143.

Almost surely, 2^79978898880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79978898880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145625149440).

79978898880 is an abundant number, since it is smaller than the sum of its proper divisors (211271400000).

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

79978898880 is a wasteful number, since it uses less digits than its factorization.

79978898880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298664 (or 298648 counting only the distinct ones).

The product of its (nonzero) digits is 1170505728, while the sum is 81.

The spelling of 79978898880 in words is "seventy-nine billion, nine hundred seventy-eight million, eight hundred ninety-eight thousand, eight hundred eighty".