90021802 has 8 divisors (see below), whose sum is σ = 145419876. Its totient is φ = 41548512.

The previous prime is 90021781. The next prime is 90021847. The reversal of 90021802 is 20812009.

It can be written as a sum of positive squares in 2 ways, for example, as 86136961 + 3884841 = 9281^2 + 1971^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1731163 + ... + 1731214.

Almost surely, 2^90021802 is an apocalyptic number.

90021802 is a deficient number, since it is larger than the sum of its proper divisors (55398074).

90021802 is a wasteful number, since it uses less digits than its factorization.

90021802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3462392.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 90021802 is about 9487.9819772173. The cubic root of 90021802 is about 448.1766582476.

The spelling of 90021802 in words is "ninety million, twenty-one thousand, eight hundred two".