79218654690 has 64 divisors (see below), whose sum is σ = 217539489024. Its totient is φ = 18085951488.

The previous prime is 79218654661. The next prime is 79218654703. The reversal of 79218654690 is 9645681297.

It is a super-2 number, since 2×79218654690² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 79218654690.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40119 + ... + 400058.

It is an arithmetic number, because the mean of its divisors is an integer number (3399054516).

Almost surely, 2^79218654690 is an apocalyptic number.

79218654690 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

79218654690 is an abundant number, since it is smaller than the sum of its proper divisors (138320834334).

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

79218654690 is a wasteful number, since it uses less digits than its factorization.

79218654690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441051.

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 79218654690 in words is "seventy-nine billion, two hundred eighteen million, six hundred fifty-four thousand, six hundred ninety".