90279779 has 4 divisors (see below), whose sum is σ = 90752640. Its totient is φ = 89806920.

The previous prime is 90279767. The next prime is 90279793. The reversal of 90279779 is 97797209.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90279779 - 2²⁴ = 73502563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90279799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236144 + ... + 236525.

It is an arithmetic number, because the mean of its divisors is an integer number (22688160).

Almost surely, 2^90279779 is an apocalyptic number.

90279779 is a deficient number, since it is larger than the sum of its proper divisors (472861).

90279779 is a wasteful number, since it uses less digits than its factorization.

90279779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472860.

The product of its (nonzero) digits is 500094, while the sum is 50.

The square root of 90279779 is about 9501.5671865224. The cubic root of 90279779 is about 448.6043657535.

The spelling of 90279779 in words is "ninety million, two hundred seventy-nine thousand, seven hundred seventy-nine".