79381520 has 20 divisors (see below), whose sum is σ = 184562220. Its totient is φ = 31752576.

The previous prime is 79381513. The next prime is 79381529. The reversal of 79381520 is 2518397.

It can be written as a sum of positive squares in 2 ways, for example, as 12730624 + 66650896 = 3568^2 + 8164^2 .

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

It is not an unprimeable number, because it can be changed into a prime (79381529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496055 + ... + 496214.

It is an arithmetic number, because the mean of its divisors is an integer number (9228111).

Almost surely, 2^79381520 is an apocalyptic number.

It is an amenable number.

79381520 is an abundant number, since it is smaller than the sum of its proper divisors (105180700).

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

79381520 is a wasteful number, since it uses less digits than its factorization.

79381520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992282 (or 992276 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 79381520 is about 8909.6307443126. The cubic root of 79381520 is about 429.7736685238.

The spelling of 79381520 in words is "seventy-nine million, three hundred eighty-one thousand, five hundred twenty".