79139745 has 24 divisors (see below), whose sum is σ = 141603072. Its totient is φ = 40845600.

The previous prime is 79139729. The next prime is 79139747. The reversal of 79139745 is 54793197.

It is not a de Polignac number, because 79139745 - 2⁴ = 79139729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 79139745.

It is not an unprimeable number, because it can be changed into a prime (79139747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26971 + ... + 29760.

It is an arithmetic number, because the mean of its divisors is an integer number (5900128).

Almost surely, 2^79139745 is an apocalyptic number.

It is an amenable number.

79139745 is a deficient number, since it is larger than the sum of its proper divisors (62463327).

79139745 is a wasteful number, since it uses less digits than its factorization.

79139745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56773 (or 56770 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 79139745 is about 8896.0522143252. The cubic root of 79139745 is about 429.3368993607.

The spelling of 79139745 in words is "seventy-nine million, one hundred thirty-nine thousand, seven hundred forty-five".