79578691 has 2 divisors, whose sum is σ = 79578692. Its totient is φ = 79578690.

The previous prime is 79578679. The next prime is 79578713. The reversal of 79578691 is 19687597.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79578691 - 2⁵ = 79578659 is a prime.

It is a super-2 number, since 2×79578691² = 12665536122546962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79578671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39789345 + 39789346.

It is an arithmetic number, because the mean of its divisors is an integer number (39789346).

Almost surely, 2^79578691 is an apocalyptic number.

79578691 is a deficient number, since it is larger than the sum of its proper divisors (1).

79578691 is an equidigital number, since it uses as much as digits as its factorization.

79578691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 52.

The square root of 79578691 is about 8920.6889307945. The cubic root of 79578691 is about 430.1292040076.

The spelling of 79578691 in words is "seventy-nine million, five hundred seventy-eight thousand, six hundred ninety-one".