90640745 has 16 divisors (see below), whose sum is σ = 120916992. Its totient is φ = 64774080.

The previous prime is 90640727. The next prime is 90640751. The reversal of 90640745 is 54704609.

It is not a de Polignac number, because 90640745 - 2⁸ = 90640489 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 20477 + ... + 24506.

It is an arithmetic number, because the mean of its divisors is an integer number (7557312).

Almost surely, 2^90640745 is an apocalyptic number.

It is an amenable number.

90640745 is a deficient number, since it is larger than the sum of its proper divisors (30276247).

90640745 is a wasteful number, since it uses less digits than its factorization.

90640745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45032.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 90640745 is about 9520.5433143282. The cubic root of 90640745 is about 449.2014562169.

The spelling of 90640745 in words is "ninety million, six hundred forty thousand, seven hundred forty-five".