79642279 has 2 divisors, whose sum is σ = 79642280. Its totient is φ = 79642278.

The previous prime is 79642259. The next prime is 79642301. The reversal of 79642279 is 97224697.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (97224697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79642279 - 2⁷ = 79642151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79642219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39821139 + 39821140.

It is an arithmetic number, because the mean of its divisors is an integer number (39821140).

Almost surely, 2^79642279 is an apocalyptic number.

79642279 is a deficient number, since it is larger than the sum of its proper divisors (1).

79642279 is an equidigital number, since it uses as much as digits as its factorization.

79642279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 46.

The square root of 79642279 is about 8924.2522936098. The cubic root of 79642279 is about 430.2437395852.

The spelling of 79642279 in words is "seventy-nine million, six hundred forty-two thousand, two hundred seventy-nine".