90909079 has 4 divisors (see below), whose sum is σ = 91846384. Its totient is φ = 89971776.

The previous prime is 90909073. The next prime is 90909089. The reversal of 90909079 is 97090909.

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 90909079 - 2¹⁷ = 90778007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90909073) 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, 468507 + ... + 468700.

It is an arithmetic number, because the mean of its divisors is an integer number (22961596).

Almost surely, 2^90909079 is an apocalyptic number.

90909079 is a deficient number, since it is larger than the sum of its proper divisors (937305).

90909079 is an equidigital number, since it uses as much as digits as its factorization.

90909079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937304.

The product of its (nonzero) digits is 45927, while the sum is 43.

The square root of 90909079 is about 9534.6252679379. The cubic root of 90909079 is about 449.6442933881.

The spelling of 90909079 in words is "ninety million, nine hundred nine thousand, seventy-nine".