90281608641 has 40 divisors (see below), whose sum is σ = 157277155200. Its totient is φ = 51589474776.

The previous prime is 90281608639. The next prime is 90281608643. The reversal of 90281608641 is 14680618209.

It is an interprime number because it is at equal distance from previous prime (90281608639) and next prime (90281608643).

It is not a de Polignac number, because 90281608641 - 2¹ = 90281608639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90281608643) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 1596981 + ... + 1652546.

It is an arithmetic number, because the mean of its divisors is an integer number (3931928880).

Almost surely, 2^90281608641 is an apocalyptic number.

It is an amenable number.

90281608641 is a deficient number, since it is larger than the sum of its proper divisors (66995546559).

90281608641 is an equidigital number, since it uses as much as digits as its factorization.

90281608641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249560 (or 3249537 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 90281608641 in words is "ninety billion, two hundred eighty-one million, six hundred eight thousand, six hundred forty-one".