79736509 has 4 divisors (see below), whose sum is σ = 79814880. Its totient is φ = 79658140.

The previous prime is 79736441. The next prime is 79736533. The reversal of 79736509 is 90563797.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79736509 - 2²³ = 71347901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79736609) 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, 37639 + ... + 39700.

It is an arithmetic number, because the mean of its divisors is an integer number (19953720).

Almost surely, 2^79736509 is an apocalyptic number.

It is an amenable number.

79736509 is a deficient number, since it is larger than the sum of its proper divisors (78371).

79736509 is a wasteful number, since it uses less digits than its factorization.

79736509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78370.

The product of its (nonzero) digits is 357210, while the sum is 46.

The square root of 79736509 is about 8929.5301668117. The cubic root of 79736509 is about 430.4133558968.

The spelling of 79736509 in words is "seventy-nine million, seven hundred thirty-six thousand, five hundred nine".