90728577 has 12 divisors (see below), whose sum is σ = 132712320. Its totient is φ = 59719608.

The previous prime is 90728563. The next prime is 90728593. The reversal of 90728577 is 77582709.

90728577 is a `hidden beast` number, since 9 + 0 + 72 + 8 + 577 = 666.

It is not a de Polignac number, because 90728577 - 2⁶ = 90728513 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (90728177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63093 + ... + 64514.

It is an arithmetic number, because the mean of its divisors is an integer number (11059360).

Almost surely, 2^90728577 is an apocalyptic number.

It is an amenable number.

90728577 is a deficient number, since it is larger than the sum of its proper divisors (41983743).

90728577 is a wasteful number, since it uses less digits than its factorization.

90728577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127692 (or 127689 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 90728577 is about 9525.1549593694. The cubic root of 90728577 is about 449.3465032936.

The spelling of 90728577 in words is "ninety million, seven hundred twenty-eight thousand, five hundred seventy-seven".