79693840 has 20 divisors (see below), whose sum is σ = 185288364. Its totient is φ = 31877504.

The previous prime is 79693799. The next prime is 79693853. The reversal of 79693840 is 4839697.

It can be written as a sum of positive squares in 2 ways, for example, as 62916624 + 16777216 = 7932^2 + 4096^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×79693840² = 12702216267891200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498007 + ... + 498166.

Almost surely, 2^79693840 is an apocalyptic number.

It is an amenable number.

79693840 is an abundant number, since it is smaller than the sum of its proper divisors (105594524).

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

79693840 is a wasteful number, since it uses less digits than its factorization.

79693840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996186 (or 996180 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 79693840 is about 8927.1406396449. The cubic root of 79693840 is about 430.3365672146.

The spelling of 79693840 in words is "seventy-nine million, six hundred ninety-three thousand, eight hundred forty".