79472639 has 4 divisors (see below), whose sum is σ = 80365680. Its totient is φ = 78579600.

The previous prime is 79472581. The next prime is 79472677. The reversal of 79472639 is 93627497.

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 79472639 - 2²⁰ = 78424063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79472593 and 79472602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79474639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446387 + ... + 446564.

It is an arithmetic number, because the mean of its divisors is an integer number (20091420).

Almost surely, 2^79472639 is an apocalyptic number.

79472639 is a deficient number, since it is larger than the sum of its proper divisors (893041).

79472639 is an equidigital number, since it uses as much as digits as its factorization.

79472639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893040.

The product of its digits is 571536, while the sum is 47.

The square root of 79472639 is about 8914.7427893350. The cubic root of 79472639 is about 429.9380458785.

The spelling of 79472639 in words is "seventy-nine million, four hundred seventy-two thousand, six hundred thirty-nine".