79691040 has 480 divisors, whose sum is σ = 338095296. Its totient is φ = 17418240.

The previous prime is 79691023. The next prime is 79691041. The reversal of 79691040 is 4019697.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 79690986 and 79691004.

It is not an unprimeable number, because it can be changed into a prime (79691041) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1853259 + ... + 1853301.

Almost surely, 2^79691040 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 79691040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169047648).

79691040 is an abundant number, since it is smaller than the sum of its proper divisors (258404256).

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

79691040 is a wasteful number, since it uses less digits than its factorization.

79691040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 79691040 is about 8926.9838131364. The cubic root of 79691040 is about 430.3315272746.

It can be divided in two parts, 7969 and 1040, that added together give a palindrome (9009).

The spelling of 79691040 in words is "seventy-nine million, six hundred ninety-one thousand, forty".