90281608639 has 2 divisors, whose sum is σ = 90281608640. Its totient is φ = 90281608638.

The previous prime is 90281608579. The next prime is 90281608643. The reversal of 90281608639 is 93680618209.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90281608639 - 2⁷ = 90281608511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90281608939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45140804319 + 45140804320.

It is an arithmetic number, because the mean of its divisors is an integer number (45140804320).

Almost surely, 2^90281608639 is an apocalyptic number.

90281608639 is a deficient number, since it is larger than the sum of its proper divisors (1).

90281608639 is an equidigital number, since it uses as much as digits as its factorization.

90281608639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 90281608639 in words is "ninety billion, two hundred eighty-one million, six hundred eight thousand, six hundred thirty-nine".