90305681 has 16 divisors (see below), whose sum is σ = 96422400. Its totient is φ = 84436800.

The previous prime is 90305671. The next prime is 90305687. The reversal of 90305681 is 18650309.

It is a cyclic number.

It is not a de Polignac number, because 90305681 - 2⁶ = 90305617 is a prime.

It is a super-2 number, since 2×90305681² = 16310232041747522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90305687) by changing a digit.

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, 125240 + ... + 125958.

It is an arithmetic number, because the mean of its divisors is an integer number (6026400).

Almost surely, 2^90305681 is an apocalyptic number.

It is an amenable number.

90305681 is a deficient number, since it is larger than the sum of its proper divisors (6116719).

90305681 is a wasteful number, since it uses less digits than its factorization.

90305681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 90305681 is about 9502.9301270713. The cubic root of 90305681 is about 448.6472643934.

The spelling of 90305681 in words is "ninety million, three hundred five thousand, six hundred eighty-one".