90086578 has 4 divisors (see below), whose sum is σ = 135129870. Its totient is φ = 45043288.

The previous prime is 90086573. The next prime is 90086593. The reversal of 90086578 is 87568009.

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., 71622369 + 18464209 = 8463^2 + 4297^2 .

It is not an unprimeable number, because it can be changed into a prime (90086573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22521643 + ... + 22521646.

Almost surely, 2^90086578 is an apocalyptic number.

90086578 is a deficient number, since it is larger than the sum of its proper divisors (45043292).

90086578 is a wasteful number, since it uses less digits than its factorization.

90086578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45043291.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 90086578 is about 9491.3949448961. The cubic root of 90086578 is about 448.2841289941.

Subtracting from 90086578 its reverse (87568009), we obtain a square (2518569 = 1587²).

It can be divided in two parts, 900 and 86578, that added together give a palindrome (87478).

The spelling of 90086578 in words is "ninety million, eighty-six thousand, five hundred seventy-eight".