79881646 has 16 divisors (see below), whose sum is σ = 129660048. Its totient is φ = 36691200.

The previous prime is 79881569. The next prime is 79881647. The reversal of 79881646 is 64618897.

It is a self number, because there is not a number n which added to its sum of digits gives 79881646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79881647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1795 + ... + 12766.

It is an arithmetic number, because the mean of its divisors is an integer number (8103753).

Almost surely, 2^79881646 is an apocalyptic number.

79881646 is a deficient number, since it is larger than the sum of its proper divisors (49778402).

79881646 is a wasteful number, since it uses less digits than its factorization.

79881646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14787.

The product of its digits is 580608, while the sum is 49.

The square root of 79881646 is about 8937.6532714130. The cubic root of 79881646 is about 430.6743448306.

The spelling of 79881646 in words is "seventy-nine million, eight hundred eighty-one thousand, six hundred forty-six".