79815797440 has 112 divisors (see below), whose sum is σ = 191908785600. Its totient is φ = 31617331200.

The previous prime is 79815797401. The next prime is 79815797459. The reversal of 79815797440 is 4479751897.

It is a super-2 number, since 2×79815797440² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16861314 + ... + 16866046.

It is an arithmetic number, because the mean of its divisors is an integer number (1713471300).

Almost surely, 2^79815797440 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 79815797440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95954392800).

79815797440 is an abundant number, since it is smaller than the sum of its proper divisors (112092988160).

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

79815797440 is a wasteful number, since it uses less digits than its factorization.

79815797440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250 (or 5240 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 61.

The spelling of 79815797440 in words is "seventy-nine billion, eight hundred fifteen million, seven hundred ninety-seven thousand, four hundred forty".