90665928 has 24 divisors (see below), whose sum is σ = 245553750. Its totient is φ = 30221952.

The previous prime is 90665921. The next prime is 90665933. The reversal of 90665928 is 82956609.

It can be written as a sum of positive squares in only one way, i.e., 87272964 + 3392964 = 9342^2 + 1842^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (90665921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 629553 + ... + 629696.

Almost surely, 2^90665928 is an apocalyptic number.

It is an amenable number.

90665928 is an abundant number, since it is smaller than the sum of its proper divisors (154887822).

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

90665928 is a wasteful number, since it uses less digits than its factorization.

90665928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259261 (or 1259254 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 90665928 is about 9521.8657835531. The cubic root of 90665928 is about 449.2430533772.

The spelling of 90665928 in words is "ninety million, six hundred sixty-five thousand, nine hundred twenty-eight".