90331280 has 40 divisors (see below), whose sum is σ = 226178232. Its totient is φ = 33352704.

The previous prime is 90331277. The next prime is 90331291. The reversal of 90331280 is 8213309.

It can be written as a sum of positive squares in 4 ways, for example, as 309136 + 90022144 = 556^2 + 9488^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42389 + ... + 44468.

Almost surely, 2^90331280 is an apocalyptic number.

It is an amenable number.

90331280 is an abundant number, since it is smaller than the sum of its proper divisors (135846952).

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

90331280 is a wasteful number, since it uses less digits than its factorization.

90331280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86883 (or 86877 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 90331280 is about 9504.2769319922. The cubic root of 90331280 is about 448.6896531488.

Adding to 90331280 its reverse (8213309), we get a palindrome (98544589).

The spelling of 90331280 in words is "ninety million, three hundred thirty-one thousand, two hundred eighty".