90278 has 4 divisors (see below), whose sum is σ = 135420. Its totient is φ = 45138.

The previous prime is 90271. The next prime is 90281. The reversal of 90278 is 87209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87209 = 37 ⋅2357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90271) by changing a digit.

90278 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22568 + ... + 22571.

It is an arithmetic number, because the mean of its divisors is an integer number (33855).

2⁹⁰²⁷⁸ is an apocalyptic number.

90278 is a deficient number, since it is larger than the sum of its proper divisors (45142).

90278 is a wasteful number, since it uses less digits than its factorization.

90278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45141.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 90278 is about 300.4629760886. The cubic root of 90278 is about 44.8601419090.

The spelling of 90278 in words is "ninety thousand, two hundred seventy-eight".