64806243 has 4 divisors (see below), whose sum is σ = 86408328. Its totient is φ = 43204160.

The previous prime is 64806239. The next prime is 64806251. The reversal of 64806243 is 34260846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64806243 - 2² = 64806239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64806223) 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 in 3 ways as a sum of consecutive naturals, for example, 10801038 + ... + 10801043.

It is an arithmetic number, because the mean of its divisors is an integer number (21602082).

Almost surely, 2^64806243 is an apocalyptic number.

64806243 is a deficient number, since it is larger than the sum of its proper divisors (21602085).

64806243 is a wasteful number, since it uses less digits than its factorization.

64806243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21602084.

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 64806243 is about 8050.2324811151. The cubic root of 64806243 is about 401.6726686163.

The spelling of 64806243 in words is "sixty-four million, eight hundred six thousand, two hundred forty-three".