79640863 has 2 divisors, whose sum is σ = 79640864. Its totient is φ = 79640862.

The previous prime is 79640857. The next prime is 79640867. The reversal of 79640863 is 36804697.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (36804697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79640863 - 2⁵ = 79640831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79640867) 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 as a sum of consecutive naturals, namely, 39820431 + 39820432.

It is an arithmetic number, because the mean of its divisors is an integer number (39820432).

Almost surely, 2^79640863 is an apocalyptic number.

79640863 is a deficient number, since it is larger than the sum of its proper divisors (1).

79640863 is an equidigital number, since it uses as much as digits as its factorization.

79640863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 79640863 is about 8924.1729588797. The cubic root of 79640863 is about 430.2411897304.

The spelling of 79640863 in words is "seventy-nine million, six hundred forty thousand, eight hundred sixty-three".