90855 has 16 divisors (see below), whose sum is σ = 161760. Its totient is φ = 48384.

The previous prime is 90847. The next prime is 90863. The reversal of 90855 is 55809.

It is an interprime number because it is at equal distance from previous prime (90847) and next prime (90863).

It is not a de Polignac number, because 90855 - 2³ = 90847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202 + ... + 471.

It is an arithmetic number, because the mean of its divisors is an integer number (10110).

2⁹⁰⁸⁵⁵ is an apocalyptic number.

90855 is a deficient number, since it is larger than the sum of its proper divisors (70905).

90855 is a wasteful number, since it uses less digits than its factorization.

90855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 681 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 90855 is about 301.4216316060. The cubic root of 90855 is about 44.9555115874.

The spelling of 90855 in words is "ninety thousand, eight hundred fifty-five".