90021717 has 12 divisors (see below), whose sum is σ = 131599104. Its totient is φ = 59290920.

The previous prime is 90021709. The next prime is 90021721. The reversal of 90021717 is 71712009.

It is not a de Polignac number, because 90021717 - 2³ = 90021709 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90020717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59509 + ... + 61002.

It is an arithmetic number, because the mean of its divisors is an integer number (10966592).

Almost surely, 2^90021717 is an apocalyptic number.

It is an amenable number.

90021717 is a deficient number, since it is larger than the sum of its proper divisors (41577387).

90021717 is a wasteful number, since it uses less digits than its factorization.

90021717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120600 (or 120597 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 90021717 is about 9487.9774978654. The cubic root of 90021717 is about 448.1765171890.

The spelling of 90021717 in words is "ninety million, twenty-one thousand, seven hundred seventeen".