79892312640 has 672 divisors, whose sum is σ = 315226598400. Its totient is φ = 17042780160.

The previous prime is 79892312639. The next prime is 79892312729. The reversal of 79892312640 is 4621329897.

It is a tau number, because it is divible by the number of its divisors (672).

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, 63456331 + ... + 63457589.

It is an arithmetic number, because the mean of its divisors is an integer number (469087200).

Almost surely, 2^79892312640 is an apocalyptic number.

79892312640 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 79892312640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157613299200).

79892312640 is an abundant number, since it is smaller than the sum of its proper divisors (235334285760).

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

79892312640 is a wasteful number, since it uses less digits than its factorization.

79892312640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 51.

The spelling of 79892312640 in words is "seventy-nine billion, eight hundred ninety-two million, three hundred twelve thousand, six hundred forty".