64285681 has 2 divisors, whose sum is σ = 64285682. Its totient is φ = 64285680.

The previous prime is 64285673. The next prime is 64285703. The reversal of 64285681 is 18658246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52070656 + 12215025 = 7216^2 + 3495^2 .

It is a cyclic number.

It is not a de Polignac number, because 64285681 - 2³ = 64285673 is a prime.

It is a super-2 number, since 2×64285681² = 8265297563267522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64285651) 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, 32142840 + 32142841.

It is an arithmetic number, because the mean of its divisors is an integer number (32142841).

Almost surely, 2^64285681 is an apocalyptic number.

It is an amenable number.

64285681 is a deficient number, since it is larger than the sum of its proper divisors (1).

64285681 is an equidigital number, since it uses as much as digits as its factorization.

64285681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 40.

The square root of 64285681 is about 8017.8351816435. The cubic root of 64285681 is about 400.5942853750.

The spelling of 64285681 in words is "sixty-four million, two hundred eighty-five thousand, six hundred eighty-one".