90978255 has 32 divisors (see below), whose sum is σ = 162846720. Its totient is φ = 48189600.

The previous prime is 90978253. The next prime is 90978259. The reversal of 90978255 is 55287909.

It is a happy number.

It is not a de Polignac number, because 90978255 - 2¹ = 90978253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 90978255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90978253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18154 + ... + 22616.

It is an arithmetic number, because the mean of its divisors is an integer number (5088960).

Almost surely, 2^90978255 is an apocalyptic number.

90978255 is a deficient number, since it is larger than the sum of its proper divisors (71868465).

90978255 is a wasteful number, since it uses less digits than its factorization.

90978255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4628 (or 4622 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 90978255 is about 9538.2521983852. The cubic root of 90978255 is about 449.7583146637.

The spelling of 90978255 in words is "ninety million, nine hundred seventy-eight thousand, two hundred fifty-five".