79806997404 has 72 divisors (see below), whose sum is σ = 205223971680. Its totient is φ = 26145748992.

The previous prime is 79806997381. The next prime is 79806997411. The reversal of 79806997404 is 40479960897.

79806997404 is a `hidden beast` number, since 7 + 9 + 80 + 69 + 97 + 404 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 460492 + ... + 609644.

It is an arithmetic number, because the mean of its divisors is an integer number (2850332940).

Almost surely, 2^79806997404 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 79806997404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102611985840).

79806997404 is an abundant number, since it is smaller than the sum of its proper divisors (125416974276).

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

79806997404 is a wasteful number, since it uses less digits than its factorization.

79806997404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149419 (or 149414 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 79806997404 in words is "seventy-nine billion, eight hundred six million, nine hundred ninety-seven thousand, four hundred four".