90578728 has 8 divisors (see below), whose sum is σ = 169835130. Its totient is φ = 45289360.

The previous prime is 90578693. The next prime is 90578743. The reversal of 90578728 is 82787509.

It can be written as a sum of positive squares in only one way, i.e., 58339044 + 32239684 = 7638^2 + 5678^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 5661163 + ... + 5661178.

Almost surely, 2^90578728 is an apocalyptic number.

It is an amenable number.

90578728 is a deficient number, since it is larger than the sum of its proper divisors (79256402).

90578728 is a wasteful number, since it uses less digits than its factorization.

90578728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11322347 (or 11322343 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 90578728 is about 9517.2857475228. The cubic root of 90578728 is about 449.0989839689.

The spelling of 90578728 in words is "ninety million, five hundred seventy-eight thousand, seven hundred twenty-eight".