90686779 has 2 divisors, whose sum is σ = 90686780. Its totient is φ = 90686778.

The previous prime is 90686767. The next prime is 90686821. The reversal of 90686779 is 97768609.

It is a weak prime.

It is an emirp because it is prime and its reverse (97768609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90686779 - 2⁵ = 90686747 is a prime.

It is a pancake number, because a pancake can be divided into 90686779 parts by 13467 straight cuts.

It is not a weakly prime, because it can be changed into another prime (90686179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45343389 + 45343390.

It is an arithmetic number, because the mean of its divisors is an integer number (45343390).

Almost surely, 2^90686779 is an apocalyptic number.

90686779 is a deficient number, since it is larger than the sum of its proper divisors (1).

90686779 is an equidigital number, since it uses as much as digits as its factorization.

90686779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The square root of 90686779 is about 9522.9606215714. The cubic root of 90686779 is about 449.2774891317.

The spelling of 90686779 in words is "ninety million, six hundred eighty-six thousand, seven hundred seventy-nine".