90533280 has 96 divisors (see below), whose sum is σ = 291320064. Its totient is φ = 23622656.

The previous prime is 90533263. The next prime is 90533291. The reversal of 90533280 is 8233509.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

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 15 ways as a sum of consecutive naturals, for example, 20554 + ... + 24566.

It is an arithmetic number, because the mean of its divisors is an integer number (3034584).

Almost surely, 2^90533280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90533280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145660032).

90533280 is an abundant number, since it is smaller than the sum of its proper divisors (200786784).

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

90533280 is a wasteful number, since it uses less digits than its factorization.

90533280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4078 (or 4070 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 90533280 is about 9514.8977924095. The cubic root of 90533280 is about 449.0238593942.

Adding to 90533280 its reverse (8233509), we get a palindrome (98766789).

The spelling of 90533280 in words is "ninety million, five hundred thirty-three thousand, two hundred eighty".