90299779 has 4 divisors (see below), whose sum is σ = 90572920. Its totient is φ = 90026640.

The previous prime is 90299749. The next prime is 90299789. The reversal of 90299779 is 97799209.

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 90299779 - 2⁵ = 90299747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90299749) 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, 136074 + ... + 136735.

It is an arithmetic number, because the mean of its divisors is an integer number (22643230).

Almost surely, 2^90299779 is an apocalyptic number.

90299779 is a deficient number, since it is larger than the sum of its proper divisors (273141).

90299779 is a wasteful number, since it uses less digits than its factorization.

90299779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273140.

The product of its (nonzero) digits is 642978, while the sum is 52.

The square root of 90299779 is about 9502.6195861983. The cubic root of 90299779 is about 448.6374902802.

The spelling of 90299779 in words is "ninety million, two hundred ninety-nine thousand, seven hundred seventy-nine".