79815140 has 24 divisors (see below), whose sum is σ = 167822592. Its totient is φ = 31885920.

The previous prime is 79815101. The next prime is 79815161. The reversal of 79815140 is 4151897.

It is a self number, because there is not a number n which added to its sum of digits gives 79815140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17807 + ... + 21833.

It is an arithmetic number, because the mean of its divisors is an integer number (6992608).

Almost surely, 2^79815140 is an apocalyptic number.

It is an amenable number.

79815140 is an abundant number, since it is smaller than the sum of its proper divisors (88007452).

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

79815140 is a wasteful number, since it uses less digits than its factorization.

79815140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5027 (or 5025 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 79815140 is about 8933.9319451180. The cubic root of 79815140 is about 430.5547913749.

The spelling of 79815140 in words is "seventy-nine million, eight hundred fifteen thousand, one hundred forty".