79878593 has 2 divisors, whose sum is σ = 79878594. Its totient is φ = 79878592.

The previous prime is 79878581. The next prime is 79878607. The reversal of 79878593 is 39587897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79780624 + 97969 = 8932^2 + 313^2 .

It is an emirp because it is prime and its reverse (39587897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79878593 - 2¹⁰ = 79877569 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79878193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39939296 + 39939297.

It is an arithmetic number, because the mean of its divisors is an integer number (39939297).

Almost surely, 2^79878593 is an apocalyptic number.

It is an amenable number.

79878593 is a deficient number, since it is larger than the sum of its proper divisors (1).

79878593 is an equidigital number, since it uses as much as digits as its factorization.

79878593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The square root of 79878593 is about 8937.4824755073. The cubic root of 79878593 is about 430.6688581070.

The spelling of 79878593 in words is "seventy-nine million, eight hundred seventy-eight thousand, five hundred ninety-three".