90388871 has 4 divisors (see below), whose sum is σ = 95146200. Its totient is φ = 85631544.

The previous prime is 90388861. The next prime is 90388927. The reversal of 90388871 is 17888309.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17888309 = 199 ⋅89891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90388871 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 (90388841) 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, 2378636 + ... + 2378673.

It is an arithmetic number, because the mean of its divisors is an integer number (23786550).

Almost surely, 2^90388871 is an apocalyptic number.

90388871 is a deficient number, since it is larger than the sum of its proper divisors (4757329).

90388871 is a wasteful number, since it uses less digits than its factorization.

90388871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4757328.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 90388871 is about 9507.3061905042. The cubic root of 90388871 is about 448.7849874051.

The spelling of 90388871 in words is "ninety million, three hundred eighty-eight thousand, eight hundred seventy-one".