90550578 has 16 divisors (see below), whose sum is σ = 182318400. Its totient is φ = 29980656.

The previous prime is 90550547. The next prime is 90550601. The reversal of 90550578 is 87505509.

It is a super-2 number, since 2×90550578² = 16398814352268168, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 49750 + ... + 51537.

It is an arithmetic number, because the mean of its divisors is an integer number (11394900).

Almost surely, 2^90550578 is an apocalyptic number.

90550578 is an abundant number, since it is smaller than the sum of its proper divisors (91767822).

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

90550578 is a wasteful number, since it uses less digits than its factorization.

90550578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101441.

The product of its (nonzero) digits is 63000, while the sum is 39.

The square root of 90550578 is about 9515.8067445698. The cubic root of 90550578 is about 449.0524555822.

The spelling of 90550578 in words is "ninety million, five hundred fifty thousand, five hundred seventy-eight".