64249769 has 2 divisors, whose sum is σ = 64249770. Its totient is φ = 64249768.

The previous prime is 64249733. The next prime is 64249813. The reversal of 64249769 is 96794246.

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., 64080025 + 169744 = 8005^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 64249769 - 2¹² = 64245673 is a prime.

It is a super-2 number, since 2×64249769² = 8256065633106722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64249169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32124884 + 32124885.

It is an arithmetic number, because the mean of its divisors is an integer number (32124885).

Almost surely, 2^64249769 is an apocalyptic number.

It is an amenable number.

64249769 is a deficient number, since it is larger than the sum of its proper divisors (1).

64249769 is an equidigital number, since it uses as much as digits as its factorization.

64249769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 47.

The square root of 64249769 is about 8015.5953615436. The cubic root of 64249769 is about 400.5196766314.

The spelling of 64249769 in words is "sixty-four million, two hundred forty-nine thousand, seven hundred sixty-nine".