79988912640 has 1280 divisors, whose sum is σ = 356267197440. Its totient is φ = 16769286144.

The previous prime is 79988912623. The next prime is 79988912659. The reversal of 79988912640 is 4621988997.

It is a tau number, because it is divible by the number of its divisors (1280).

It is a super-2 number, since 2×79988912640² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 509483442 + ... + 509483598.

It is an arithmetic number, because the mean of its divisors is an integer number (278333748).

Almost surely, 2^79988912640 is an apocalyptic number.

79988912640 is a gapful number since it is divisible by the number (70) 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 79988912640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178133598720).

79988912640 is an abundant number, since it is smaller than the sum of its proper divisors (276278284800).

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

79988912640 is an equidigital number, since it uses as much as digits as its factorization.

79988912640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 79988912640 in words is "seventy-nine billion, nine hundred eighty-eight million, nine hundred twelve thousand, six hundred forty".