79139580 has 96 divisors (see below), whose sum is σ = 240195648. Its totient is φ = 19353600.

The previous prime is 79139569. The next prime is 79139581. The reversal of 79139580 is 8593197.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79139581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187770 + ... + 188190.

It is an arithmetic number, because the mean of its divisors is an integer number (2502038).

Almost surely, 2^79139580 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79139580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120097824).

79139580 is an abundant number, since it is smaller than the sum of its proper divisors (161056068).

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

79139580 is a wasteful number, since it uses less digits than its factorization.

79139580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 685 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 79139580 is about 8896.0429405438. The cubic root of 79139580 is about 429.3366009829.

The spelling of 79139580 in words is "seventy-nine million, one hundred thirty-nine thousand, five hundred eighty".