72613579 has 4 divisors (see below), whose sum is σ = 76884984. Its totient is φ = 68342176.

The previous prime is 72613577. The next prime is 72613603. The reversal of 72613579 is 97531627.

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

It is not a de Polignac number, because 72613579 - 2¹ = 72613577 is a prime.

It is a super-3 number, since 3×72613579³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72613577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2135677 + ... + 2135710.

It is an arithmetic number, because the mean of its divisors is an integer number (19221246).

Almost surely, 2^72613579 is an apocalyptic number.

72613579 is a deficient number, since it is larger than the sum of its proper divisors (4271405).

72613579 is a wasteful number, since it uses less digits than its factorization.

72613579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271404.

The product of its digits is 79380, while the sum is 40.

The square root of 72613579 is about 8521.3601613827. The cubic root of 72613579 is about 417.1951787942.

The spelling of 72613579 in words is "seventy-two million, six hundred thirteen thousand, five hundred seventy-nine".