90281986 has 8 divisors (see below), whose sum is σ = 136020240. Its totient is φ = 44941908.

The previous prime is 90281957. The next prime is 90281993. The reversal of 90281986 is 68918209.

It is a happy number.

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

It is a super-2 number, since 2×90281986² = 16301673992208392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98976 + ... + 99883.

It is an arithmetic number, because the mean of its divisors is an integer number (17002530).

Almost surely, 2^90281986 is an apocalyptic number.

90281986 is a deficient number, since it is larger than the sum of its proper divisors (45738254).

90281986 is a wasteful number, since it uses less digits than its factorization.

90281986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199088.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 90281986 is about 9501.6833245483. The cubic root of 90281986 is about 448.6080212851.

The spelling of 90281986 in words is "ninety million, two hundred eighty-one thousand, nine hundred eighty-six".