79999799040 has 1296 divisors, whose sum is σ = 347328989280. Its totient is φ = 17557585920.

The previous prime is 79999799039. The next prime is 79999799053. The reversal of 79999799040 is 4099799997.

It is a tau number, because it is divible by the number of its divisors (1296).

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

It is a self number, because there is not a number n which added to its sum of digits gives 79999799040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 441987750 + ... + 441987930.

Almost surely, 2^79999799040 is an apocalyptic number.

79999799040 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 79999799040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173664494640).

79999799040 is an abundant number, since it is smaller than the sum of its proper divisors (267329190240).

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

79999799040 is a wasteful number, since it uses less digits than its factorization.

79999799040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 104162436, while the sum is 72.

The spelling of 79999799040 in words is "seventy-nine billion, nine hundred ninety-nine million, seven hundred ninety-nine thousand, forty".