90578779 has 2 divisors, whose sum is σ = 90578780. Its totient is φ = 90578778.

The previous prime is 90578773. The next prime is 90578791. The reversal of 90578779 is 97787509.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90578779 - 2⁷ = 90578651 is a prime.

It is not a weakly prime, because it can be changed into another prime (90578773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45289389 + 45289390.

It is an arithmetic number, because the mean of its divisors is an integer number (45289390).

Almost surely, 2^90578779 is an apocalyptic number.

90578779 is a deficient number, since it is larger than the sum of its proper divisors (1).

90578779 is an equidigital number, since it uses as much as digits as its factorization.

90578779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1111320, while the sum is 52.

The square root of 90578779 is about 9517.2884268577. The cubic root of 90578779 is about 449.0990682567.

The spelling of 90578779 in words is "ninety million, five hundred seventy-eight thousand, seven hundred seventy-nine".