90644518 has 16 divisors (see below), whose sum is σ = 142109280. Its totient is φ = 43281216.

The previous prime is 90644479. The next prime is 90644539. The reversal of 90644518 is 81544609.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36946 + ... + 39322.

It is an arithmetic number, because the mean of its divisors is an integer number (8881830).

Almost surely, 2^90644518 is an apocalyptic number.

90644518 is a deficient number, since it is larger than the sum of its proper divisors (51464762).

90644518 is a wasteful number, since it uses less digits than its factorization.

90644518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 90644518 is about 9520.7414627223. The cubic root of 90644518 is about 449.2076889311.

Subtracting from 90644518 its reverse (81544609), we obtain a palindrome (9099909).

The spelling of 90644518 in words is "ninety million, six hundred forty-four thousand, five hundred eighteen".