90555790 has 32 divisors (see below), whose sum is σ = 176188320. Its totient is φ = 33312384.

The previous prime is 90555769. The next prime is 90555797. The reversal of 90555790 is 9755509.

It is a super-2 number, since 2×90555790² = 16400702205048200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90555797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38776 + ... + 41044.

It is an arithmetic number, because the mean of its divisors is an integer number (5505885).

Almost surely, 2^90555790 is an apocalyptic number.

90555790 is a deficient number, since it is larger than the sum of its proper divisors (85632530).

90555790 is a wasteful number, since it uses less digits than its factorization.

90555790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2596.

The product of its (nonzero) digits is 70875, while the sum is 40.

The square root of 90555790 is about 9516.0806007516. The cubic root of 90555790 is about 449.0610710858.

The spelling of 90555790 in words is "ninety million, five hundred fifty-five thousand, seven hundred ninety".