90278685 has 64 divisors (see below), whose sum is σ = 185794560. Its totient is φ = 40737600.

The previous prime is 90278677. The next prime is 90278689. The reversal of 90278685 is 58687209.

It is not a de Polignac number, because 90278685 - 2³ = 90278677 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90278685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90278689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77860 + ... + 79010.

It is an arithmetic number, because the mean of its divisors is an integer number (2903040).

Almost surely, 2^90278685 is an apocalyptic number.

It is an amenable number.

90278685 is an abundant number, since it is smaller than the sum of its proper divisors (95515875).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90278685 is a wasteful number, since it uses less digits than its factorization.

90278685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255 (or 1249 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 90278685 is about 9501.5096168977. The cubic root of 90278685 is about 448.6025537007.

The spelling of 90278685 in words is "ninety million, two hundred seventy-eight thousand, six hundred eighty-five".