79090991804 has 12 divisors (see below), whose sum is σ = 150991893528. Its totient is φ = 35950450800.

The previous prime is 79090991789. The next prime is 79090991807. The reversal of 79090991804 is 40819909097.

It is a self number, because there is not a number n which added to its sum of digits gives 79090991804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79090991807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 898761227 + ... + 898761314.

It is an arithmetic number, because the mean of its divisors is an integer number (12582657794).

Almost surely, 2^79090991804 is an apocalyptic number.

It is an amenable number.

79090991804 is a deficient number, since it is larger than the sum of its proper divisors (71900901724).

79090991804 is a wasteful number, since it uses less digits than its factorization.

79090991804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797522556 (or 1797522554 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 56.

The spelling of 79090991804 in words is "seventy-nine billion, ninety million, nine hundred ninety-one thousand, eight hundred four".