90805390 has 24 divisors (see below), whose sum is σ = 176993208. Its totient is φ = 33527520.

The previous prime is 90805387. The next prime is 90805433. The reversal of 90805390 is 9350809.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 25176 + ... + 28555.

It is an arithmetic number, because the mean of its divisors is an integer number (7374717).

Almost surely, 2^90805390 is an apocalyptic number.

90805390 is a deficient number, since it is larger than the sum of its proper divisors (86187818).

90805390 is a wasteful number, since it uses less digits than its factorization.

90805390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53764 (or 53751 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 90805390 is about 9529.1862191900. The cubic root of 90805390 is about 449.4732767171.

The spelling of 90805390 in words is "ninety million, eight hundred five thousand, three hundred ninety".