64775869 has 2 divisors, whose sum is σ = 64775870. Its totient is φ = 64775868.

The previous prime is 64775857. The next prime is 64775897. The reversal of 64775869 is 96857746.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50623225 + 14152644 = 7115^2 + 3762^2 .

It is a cyclic number.

It is not a de Polignac number, because 64775869 - 2⁷ = 64775741 is a prime.

It is a super-2 number, since 2×64775869² = 8391826409410322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64775819) 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, 32387934 + 32387935.

It is an arithmetic number, because the mean of its divisors is an integer number (32387935).

Almost surely, 2^64775869 is an apocalyptic number.

It is an amenable number.

64775869 is a deficient number, since it is larger than the sum of its proper divisors (1).

64775869 is an equidigital number, since it uses as much as digits as its factorization.

64775869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 52.

The square root of 64775869 is about 8048.3457306455. The cubic root of 64775869 is about 401.6099055674.

The spelling of 64775869 in words is "sixty-four million, seven hundred seventy-five thousand, eight hundred sixty-nine".