90765728 has 24 divisors (see below), whose sum is σ = 186465888. Its totient is φ = 43409344.

The previous prime is 90765673. The next prime is 90765739. The reversal of 90765728 is 82756709.

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 3 ways as a sum of consecutive naturals, for example, 60926 + ... + 62397.

It is an arithmetic number, because the mean of its divisors is an integer number (7769412).

Almost surely, 2^90765728 is an apocalyptic number.

It is an amenable number.

90765728 is an abundant number, since it is smaller than the sum of its proper divisors (95700160).

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

90765728 is a wasteful number, since it uses less digits than its factorization.

90765728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123356 (or 123348 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 90765728 is about 9527.1049117767. The cubic root of 90765728 is about 449.4078268386.

The spelling of 90765728 in words is "ninety million, seven hundred sixty-five thousand, seven hundred twenty-eight".