64909369 has 6 divisors (see below), whose sum is σ = 75506874. Its totient is φ = 55636560.

The previous prime is 64909331. The next prime is 64909387. The reversal of 64909369 is 96390946.

It can be written as a sum of positive squares in only one way, i.e., 57684025 + 7225344 = 7595^2 + 2688^2 .

It is not a de Polignac number, because 64909369 - 2⁷ = 64909241 is a prime.

It is a super-2 number, since 2×64909369² = 8426452367956322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64909069) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 662292 + ... + 662389.

It is an arithmetic number, because the mean of its divisors is an integer number (12584479).

Almost surely, 2^64909369 is an apocalyptic number.

It is an amenable number.

64909369 is a deficient number, since it is larger than the sum of its proper divisors (10597505).

64909369 is a wasteful number, since it uses less digits than its factorization.

64909369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324695 (or 1324688 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 64909369 is about 8056.6350916496. The cubic root of 64909369 is about 401.8856159141.

The spelling of 64909369 in words is "sixty-four million, nine hundred nine thousand, three hundred sixty-nine".