64649023 has 2 divisors, whose sum is σ = 64649024. Its totient is φ = 64649022.

The previous prime is 64649009. The next prime is 64649041. The reversal of 64649023 is 32094646.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64649023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64649023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64649063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32324511 + 32324512.

It is an arithmetic number, because the mean of its divisors is an integer number (32324512).

Almost surely, 2^64649023 is an apocalyptic number.

64649023 is a deficient number, since it is larger than the sum of its proper divisors (1).

64649023 is an equidigital number, since it uses as much as digits as its factorization.

64649023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 64649023 is about 8040.4616161014. The cubic root of 64649023 is about 401.3475861804.

The spelling of 64649023 in words is "sixty-four million, six hundred forty-nine thousand, twenty-three".