79021707664 has 45 divisors (see below), whose sum is σ = 158272549131. Its totient is φ = 38219443680.

The previous prime is 79021707641. The next prime is 79021707679. The reversal of 79021707664 is 46670712097.

The square root of 79021707664 is 281108.

It is a perfect power (a square), and thus also a powerful number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 34856259 + ... + 34858525.

Almost surely, 2^79021707664 is an apocalyptic number.

79021707664 is the 281108-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79021707664

79021707664 is an abundant number, since it is smaller than the sum of its proper divisors (79250841467).

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

79021707664 is an frugal number, since it uses more digits than its factorization.

79021707664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604 (or 2300 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 49.

Multiplying 79021707664 by its sum of digits (49), we get a square (3872063675536 = 1967756²).

The spelling of 79021707664 in words is "seventy-nine billion, twenty-one million, seven hundred seven thousand, six hundred sixty-four".