79231640 has 16 divisors (see below), whose sum is σ = 178271280. Its totient is φ = 31692640.

The previous prime is 79231601. The next prime is 79231657. The reversal of 79231640 is 4613297.

It is a junction number, because it is equal to n+sod(n) for n = 79231597 and 79231606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 990356 + ... + 990435.

It is an arithmetic number, because the mean of its divisors is an integer number (11141955).

Almost surely, 2^79231640 is an apocalyptic number.

It is an amenable number.

79231640 is an abundant number, since it is smaller than the sum of its proper divisors (99039640).

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

79231640 is a wasteful number, since it uses less digits than its factorization.

79231640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980802 (or 1980798 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 79231640 is about 8901.2156473147. The cubic root of 79231640 is about 429.5030133374.

The spelling of 79231640 in words is "seventy-nine million, two hundred thirty-one thousand, six hundred forty".