90436187 has 4 divisors (see below), whose sum is σ = 90634536. Its totient is φ = 90237840.

The previous prime is 90436183. The next prime is 90436189. The reversal of 90436187 is 78163409.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90436187 - 2² = 90436183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90436187.

It is not an unprimeable number, because it can be changed into a prime (90436183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98489 + ... + 99402.

It is an arithmetic number, because the mean of its divisors is an integer number (22658634).

Almost surely, 2^90436187 is an apocalyptic number.

90436187 is a deficient number, since it is larger than the sum of its proper divisors (198349).

90436187 is a wasteful number, since it uses less digits than its factorization.

90436187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198348.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 90436187 is about 9509.7942669650. The cubic root of 90436187 is about 448.8632824653.

The spelling of 90436187 in words is "ninety million, four hundred thirty-six thousand, one hundred eighty-seven".