64544993 has 2 divisors, whose sum is σ = 64544994. Its totient is φ = 64544992.

The previous prime is 64544989. The next prime is 64545001. The reversal of 64544993 is 39944546.

It is a happy number.

64544993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37847104 + 26697889 = 6152^2 + 5167^2 .

It is a cyclic number.

It is not a de Polignac number, because 64544993 - 2² = 64544989 is a prime.

It is a super-2 number, since 2×64544993² = 8332112242740098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64543993) 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 as a sum of consecutive naturals, namely, 32272496 + 32272497.

It is an arithmetic number, because the mean of its divisors is an integer number (32272497).

Almost surely, 2^64544993 is an apocalyptic number.

It is an amenable number.

64544993 is a deficient number, since it is larger than the sum of its proper divisors (1).

64544993 is an equidigital number, since it uses as much as digits as its factorization.

64544993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 44.

The square root of 64544993 is about 8033.9898556072. The cubic root of 64544993 is about 401.1321943994.

The spelling of 64544993 in words is "sixty-four million, five hundred forty-four thousand, nine hundred ninety-three".