79694640 has 180 divisors, whose sum is σ = 285053184. Its totient is φ = 19949568.

The previous prime is 79694617. The next prime is 79694711. The reversal of 79694640 is 4649697.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 207889 + ... + 208271.

Almost surely, 2^79694640 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 79694640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142526592).

79694640 is an abundant number, since it is smaller than the sum of its proper divisors (205358544).

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

79694640 is a wasteful number, since it uses less digits than its factorization.

79694640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 79694640 is about 8927.1854467128. The cubic root of 79694640 is about 430.3380071757.

The spelling of 79694640 in words is "seventy-nine million, six hundred ninety-four thousand, six hundred forty".