64243669 has 16 divisors (see below), whose sum is σ = 77598720. Its totient is φ = 51994800.

The previous prime is 64243667. The next prime is 64243681. The reversal of 64243669 is 96634246.

64243669 = 96² + 97² + ... + 578².

It is a cyclic number.

It is not a de Polignac number, because 64243669 - 2¹ = 64243667 is a prime.

It is a super-2 number, since 2×64243669² = 8254498013163122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64243661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10194 + ... + 15244.

It is an arithmetic number, because the mean of its divisors is an integer number (4849920).

Almost surely, 2^64243669 is an apocalyptic number.

It is an amenable number.

64243669 is a deficient number, since it is larger than the sum of its proper divisors (13355051).

64243669 is a wasteful number, since it uses less digits than its factorization.

64243669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5160.

The product of its digits is 186624, while the sum is 40.

The square root of 64243669 is about 8015.2148442821. The cubic root of 64243669 is about 400.5070008538.

The spelling of 64243669 in words is "sixty-four million, two hundred forty-three thousand, six hundred sixty-nine".