90199087 has 12 divisors (see below), whose sum is σ = 99829800. Its totient is φ = 81432560.

The previous prime is 90199073. The next prime is 90199091. The reversal of 90199087 is 78099109.

It is a de Polignac number, because none of the positive numbers 2^k-90199087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90199027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15528 + ... + 20530.

It is an arithmetic number, because the mean of its divisors is an integer number (8319150).

Almost surely, 2^90199087 is an apocalyptic number.

90199087 is a deficient number, since it is larger than the sum of its proper divisors (9630713).

90199087 is a wasteful number, since it uses less digits than its factorization.

90199087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5174 (or 5163 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 90199087 is about 9497.3199903973. The cubic root of 90199087 is about 448.4706718298.

The spelling of 90199087 in words is "ninety million, one hundred ninety-nine thousand, eighty-seven".