90086818 has 16 divisors (see below), whose sum is σ = 141711480. Its totient is φ = 42892416.

The previous prime is 90086807. The next prime is 90086819. The reversal of 90086818 is 81868009.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 59028489 + 31058329 = 7683^2 + 5573^2 .

It is a super-3 number, since 3×90086818³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (90086819) 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, 6405 + ... + 14872.

Almost surely, 2^90086818 is an apocalyptic number.

90086818 is a deficient number, since it is larger than the sum of its proper divisors (51624662).

90086818 is a wasteful number, since it uses less digits than its factorization.

90086818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21381.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 90086818 is about 9491.4075879187. The cubic root of 90086818 is about 448.2845270856.

The spelling of 90086818 in words is "ninety million, eighty-six thousand, eight hundred eighteen".