90201690 has 24 divisors (see below), whose sum is σ = 234524628. Its totient is φ = 24053760.

The previous prime is 90201689. The next prime is 90201701. The reversal of 90201690 is 9610209.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 86434209 + 3767481 = 9297^2 + 1941^2 .

It is a super-2 number, since 2×90201690² = 16272689757712200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 501031 + ... + 501210.

Almost surely, 2^90201690 is an apocalyptic number.

90201690 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

90201690 is an abundant number, since it is smaller than the sum of its proper divisors (144322938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90201690 is a wasteful number, since it uses less digits than its factorization.

90201690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002254 (or 1002251 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 90201690 is about 9497.4570280681. The cubic root of 90201690 is about 448.4749858347.

Adding to 90201690 its reverse (9610209), we get a palindrome (99811899).

The spelling of 90201690 in words is "ninety million, two hundred one thousand, six hundred ninety".