79797640 has 32 divisors (see below), whose sum is σ = 193357080. Its totient is φ = 29463552.

The previous prime is 79797629. The next prime is 79797659. The reversal of 79797640 is 4679797.

It can be written as a sum of positive squares in 4 ways, for example, as 71537764 + 8259876 = 8458^2 + 2874^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76209 + ... + 77248.

Almost surely, 2^79797640 is an apocalyptic number.

It is an amenable number.

79797640 is an abundant number, since it is smaller than the sum of its proper divisors (113559440).

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

79797640 is a wasteful number, since it uses less digits than its factorization.

79797640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153481 (or 153477 counting only the distinct ones).

The product of its (nonzero) digits is 666792, while the sum is 49.

The square root of 79797640 is about 8932.9524794437. The cubic root of 79797640 is about 430.5233217415.

The spelling of 79797640 in words is "seventy-nine million, seven hundred ninety-seven thousand, six hundred forty".