90002090 has 8 divisors (see below), whose sum is σ = 162003780. Its totient is φ = 36000832.

The previous prime is 90002089. The next prime is 90002117. The reversal of 90002090 is 9020009.

It can be written as a sum of positive squares in 2 ways, for example, as 88491649 + 1510441 = 9407^2 + 1229^2 .

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

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, 4500095 + ... + 4500114.

Almost surely, 2^90002090 is an apocalyptic number.

90002090 is a deficient number, since it is larger than the sum of its proper divisors (72001690).

90002090 is a wasteful number, since it uses less digits than its factorization.

90002090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9000216.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 90002090 is about 9486.9431325375. The cubic root of 90002090 is about 448.1439435681.

Adding to 90002090 its reverse (9020009), we get a palindrome (99022099).

The spelling of 90002090 in words is "ninety million, two thousand, ninety".