90021716 has 6 divisors (see below), whose sum is σ = 157538010. Its totient is φ = 45010856.

The previous prime is 90021709. The next prime is 90021721. The reversal of 90021716 is 61712009.

90021716 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 83539600 + 6482116 = 9140^2 + 2546^2 .

90021716 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11252711 + ... + 11252718.

It is an arithmetic number, because the mean of its divisors is an integer number (26256335).

Almost surely, 2^90021716 is an apocalyptic number.

It is an amenable number.

90021716 is a deficient number, since it is larger than the sum of its proper divisors (67516294).

90021716 is a wasteful number, since it uses less digits than its factorization.

90021716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22505433 (or 22505431 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 90021716 is about 9487.9774451671. The cubic root of 90021716 is about 448.1765155295.

The spelling of 90021716 in words is "ninety million, twenty-one thousand, seven hundred sixteen".