79222639 has 4 divisors (see below), whose sum is σ = 81778240. Its totient is φ = 76667040.

The previous prime is 79222631. The next prime is 79222657. The reversal of 79222639 is 93622297.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93622297 = 2423 ⋅38639.

It is a cyclic number.

It is not a de Polignac number, because 79222639 - 2³ = 79222631 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 (79222631) 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, 1277754 + ... + 1277815.

It is an arithmetic number, because the mean of its divisors is an integer number (20444560).

Almost surely, 2^79222639 is an apocalyptic number.

79222639 is a deficient number, since it is larger than the sum of its proper divisors (2555601).

79222639 is a wasteful number, since it uses less digits than its factorization.

79222639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555600.

The product of its digits is 81648, while the sum is 40.

The square root of 79222639 is about 8900.7100278573. The cubic root of 79222639 is about 429.4867483578.

The spelling of 79222639 in words is "seventy-nine million, two hundred twenty-two thousand, six hundred thirty-nine".