90220399 has 4 divisors (see below), whose sum is σ = 90245464. Its totient is φ = 90195336.

The previous prime is 90220397. The next prime is 90220433. The reversal of 90220399 is 99302209.

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 90220399 - 2¹ = 90220397 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 (90220397) 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, 5997 + ... + 14710.

It is an arithmetic number, because the mean of its divisors is an integer number (22561366).

Almost surely, 2^90220399 is an apocalyptic number.

90220399 is a deficient number, since it is larger than the sum of its proper divisors (25065).

90220399 is a wasteful number, since it uses less digits than its factorization.

90220399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25064.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 90220399 is about 9498.4419248633. The cubic root of 90220399 is about 448.5059902002.

The spelling of 90220399 in words is "ninety million, two hundred twenty thousand, three hundred ninety-nine".