79909318640 has 40 divisors (see below), whose sum is σ = 186218320848. Its totient is φ = 31889894400.

The previous prime is 79909318639. The next prime is 79909318649. The reversal of 79909318640 is 4681390997.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79909318649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1118786 + ... + 1188065.

Almost surely, 2^79909318640 is an apocalyptic number.

It is an amenable number.

79909318640 is an abundant number, since it is smaller than the sum of its proper divisors (106309002208).

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

79909318640 is a wasteful number, since it uses less digits than its factorization.

79909318640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307297 (or 2307291 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 56.

The spelling of 79909318640 in words is "seventy-nine billion, nine hundred nine million, three hundred eighteen thousand, six hundred forty".