90449281 has 8 divisors (see below), whose sum is σ = 97899200. Its totient is φ = 83069712.

The previous prime is 90449279. The next prime is 90449287. The reversal of 90449281 is 18294409.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90449281 - 2¹ = 90449279 is a prime.

It is a super-2 number, since 2×90449281² = 16362144866833922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90449281.

It is not an unprimeable number, because it can be changed into a prime (90449287) 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, 14895 + ... + 20068.

It is an arithmetic number, because the mean of its divisors is an integer number (12237400).

Almost surely, 2^90449281 is an apocalyptic number.

It is an amenable number.

90449281 is a deficient number, since it is larger than the sum of its proper divisors (7449919).

90449281 is a wasteful number, since it uses less digits than its factorization.

90449281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35175.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 90449281 is about 9510.4826901688. The cubic root of 90449281 is about 448.8849446353.

The spelling of 90449281 in words is "ninety million, four hundred forty-nine thousand, two hundred eighty-one".