90878 has 4 divisors (see below), whose sum is σ = 136320. Its totient is φ = 45438.

The previous prime is 90863. The next prime is 90887. The reversal of 90878 is 87809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87809 = 277 ⋅317.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

90878 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22718 + ... + 22721.

It is an arithmetic number, because the mean of its divisors is an integer number (34080).

2⁹⁰⁸⁷⁸ is an apocalyptic number.

90878 is a deficient number, since it is larger than the sum of its proper divisors (45442).

90878 is a wasteful number, since it uses less digits than its factorization.

90878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45441.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 90878 is about 301.4597817288. The cubic root of 90878 is about 44.9593047726.

The spelling of 90878 in words is "ninety thousand, eight hundred seventy-eight".