90015280 has 40 divisors (see below), whose sum is σ = 209687472. Its totient is φ = 35937024.

The previous prime is 90015271. The next prime is 90015281. The reversal of 90015280 is 8251009.

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

It is not an unprimeable number, because it can be changed into a prime (90015281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69519 + ... + 70801.

Almost surely, 2^90015280 is an apocalyptic number.

It is an amenable number.

90015280 is an abundant number, since it is smaller than the sum of its proper divisors (119672192).

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

90015280 is a wasteful number, since it uses less digits than its factorization.

90015280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173 (or 2167 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 90015280 is about 9487.6382730372. The cubic root of 90015280 is about 448.1658346519.

Adding to 90015280 its reverse (8251009), we get a palindrome (98266289).

The spelling of 90015280 in words is "ninety million, fifteen thousand, two hundred eighty".