72609979 has 4 divisors (see below), whose sum is σ = 78195376. Its totient is φ = 67024584.

The previous prime is 72609949. The next prime is 72610007. The reversal of 72609979 is 97990627.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72609979 - 2⁷ = 72609851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72609949) 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, 2792679 + ... + 2792704.

It is an arithmetic number, because the mean of its divisors is an integer number (19548844).

Almost surely, 2^72609979 is an apocalyptic number.

72609979 is a deficient number, since it is larger than the sum of its proper divisors (5585397).

72609979 is a wasteful number, since it uses less digits than its factorization.

72609979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5585396.

The product of its (nonzero) digits is 428652, while the sum is 49.

The square root of 72609979 is about 8521.1489248810. The cubic root of 72609979 is about 417.1882841817.

The spelling of 72609979 in words is "seventy-two million, six hundred nine thousand, nine hundred seventy-nine".