85788779 has 2 divisors, whose sum is σ = 85788780. Its totient is φ = 85788778.

The previous prime is 85788761. The next prime is 85788799. The reversal of 85788779 is 97788758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85788779 - 2²⁴ = 69011563 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (85788709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42894389 + 42894390.

It is an arithmetic number, because the mean of its divisors is an integer number (42894390).

Almost surely, 2^85788779 is an apocalyptic number.

85788779 is a deficient number, since it is larger than the sum of its proper divisors (1).

85788779 is an equidigital number, since it uses as much as digits as its factorization.

85788779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7902720, while the sum is 59.

The square root of 85788779 is about 9262.2232212358. The cubic root of 85788779 is about 441.0388315654.

The spelling of 85788779 in words is "eighty-five million, seven hundred eighty-eight thousand, seven hundred seventy-nine".