90805530 has 16 divisors (see below), whose sum is σ = 217933344. Its totient is φ = 24214800.

The previous prime is 90805501. The next prime is 90805531. The reversal of 90805530 is 3550809.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 3026851 = 90805530 / (9 + 0 + 8 + 0 + 5 + 5 + 3 + 0).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90805531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1513396 + ... + 1513455.

It is an arithmetic number, because the mean of its divisors is an integer number (13620834).

Almost surely, 2^90805530 is an apocalyptic number.

90805530 is an abundant number, since it is smaller than the sum of its proper divisors (127127814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90805530 is a wasteful number, since it uses less digits than its factorization.

90805530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026861.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 90805530 is about 9529.1935650400. The cubic root of 90805530 is about 449.4735077101.

The spelling of 90805530 in words is "ninety million, eight hundred five thousand, five hundred thirty".