90521680 has 40 divisors (see below), whose sum is σ = 210859272. Its totient is φ = 36140544.

The previous prime is 90521659. The next prime is 90521687. The reversal of 90521680 is 8612509.

It can be written as a sum of positive squares in 4 ways, for example, as 9809424 + 80712256 = 3132^2 + 8984^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90521687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80482 + ... + 81598.

Almost surely, 2^90521680 is an apocalyptic number.

It is an amenable number.

90521680 is an abundant number, since it is smaller than the sum of its proper divisors (120337592).

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

90521680 is a wasteful number, since it uses less digits than its factorization.

90521680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143 (or 2137 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 90521680 is about 9514.2882024879. The cubic root of 90521680 is about 449.0046808142.

The spelling of 90521680 in words is "ninety million, five hundred twenty-one thousand, six hundred eighty".