90578 has 4 divisors (see below), whose sum is σ = 135870. Its totient is φ = 45288.

The previous prime is 90547. The next prime is 90583. The reversal of 90578 is 87509.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 64009 + 26569 = 253^2 + 163^2 .

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 90578.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22643 + ... + 22646.

2⁹⁰⁵⁷⁸ is an apocalyptic number.

90578 is a deficient number, since it is larger than the sum of its proper divisors (45292).

90578 is a wasteful number, since it uses less digits than its factorization.

90578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45291.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 90578 is about 300.9617915949. The cubic root of 90578 is about 44.9097780799.

The spelling of 90578 in words is "ninety thousand, five hundred seventy-eight".