64890583 has 2 divisors, whose sum is σ = 64890584. Its totient is φ = 64890582.

The previous prime is 64890559. The next prime is 64890587. The reversal of 64890583 is 38509846.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64890583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64890587) 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, 32445291 + 32445292.

It is an arithmetic number, because the mean of its divisors is an integer number (32445292).

Almost surely, 2^64890583 is an apocalyptic number.

64890583 is a deficient number, since it is larger than the sum of its proper divisors (1).

64890583 is an equidigital number, since it uses as much as digits as its factorization.

64890583 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 64890583 is about 8055.4691359349. The cubic root of 64890583 is about 401.8468410717.

The spelling of 64890583 in words is "sixty-four million, eight hundred ninety thousand, five hundred eighty-three".