79878811 has 2 divisors, whose sum is σ = 79878812. Its totient is φ = 79878810.

The previous prime is 79878781. The next prime is 79878857. The reversal of 79878811 is 11887897.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79878811 - 2¹¹ = 79876763 is a prime.

It is not a weakly prime, because it can be changed into another prime (79878871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39939405 + 39939406.

It is an arithmetic number, because the mean of its divisors is an integer number (39939406).

Almost surely, 2^79878811 is an apocalyptic number.

79878811 is a deficient number, since it is larger than the sum of its proper divisors (1).

79878811 is an equidigital number, since it uses as much as digits as its factorization.

79878811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 49.

The square root of 79878811 is about 8937.4946713271. The cubic root of 79878811 is about 430.6692498921.

The spelling of 79878811 in words is "seventy-nine million, eight hundred seventy-eight thousand, eight hundred eleven".