90607281 has 16 divisors (see below), whose sum is σ = 130412160. Its totient is φ = 55784960.

The previous prime is 90607267. The next prime is 90607301. The reversal of 90607281 is 18270609.

It is a cyclic number.

It is not a de Polignac number, because 90607281 - 2⁶ = 90607217 is a prime.

It is a super-2 number, since 2×90607281² = 16419358740425922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90607241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20640 + ... + 24641.

It is an arithmetic number, because the mean of its divisors is an integer number (8150760).

Almost surely, 2^90607281 is an apocalyptic number.

It is an amenable number.

90607281 is a deficient number, since it is larger than the sum of its proper divisors (39804879).

90607281 is a wasteful number, since it uses less digits than its factorization.

90607281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45336.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 90607281 is about 9518.7856893619. The cubic root of 90607281 is about 449.1461686167.

The spelling of 90607281 in words is "ninety million, six hundred seven thousand, two hundred eighty-one".