90305569 has 4 divisors (see below), whose sum is σ = 90343444. Its totient is φ = 90267696.

The previous prime is 90305563. The next prime is 90305591. The reversal of 90305569 is 96550309.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42419169 + 47886400 = 6513^2 + 6920^2 .

It is a cyclic number.

It is not a de Polignac number, because 90305569 - 2³ = 90305561 is a prime.

It is a super-2 number, since 2×90305569² = 16310191584827522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90305561) 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, 15102 + ... + 20215.

It is an arithmetic number, because the mean of its divisors is an integer number (22585861).

Almost surely, 2^90305569 is an apocalyptic number.

It is an amenable number.

90305569 is a deficient number, since it is larger than the sum of its proper divisors (37875).

90305569 is a wasteful number, since it uses less digits than its factorization.

90305569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37874.

The product of its (nonzero) digits is 36450, while the sum is 37.

The square root of 90305569 is about 9502.9242341502. The cubic root of 90305569 is about 448.6470789177.

The spelling of 90305569 in words is "ninety million, three hundred five thousand, five hundred sixty-nine".