64636243 has 6 divisors (see below), whose sum is σ = 75189156. Its totient is φ = 55402452.

The previous prime is 64636223. The next prime is 64636259. The reversal of 64636243 is 34263646.

It is a de Polignac number, because none of the positive numbers 2^k-64636243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64636199 and 64636208.

It is not an unprimeable number, because it can be changed into a prime (64636223) 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, 659505 + ... + 659602.

It is an arithmetic number, because the mean of its divisors is an integer number (12531526).

Almost surely, 2^64636243 is an apocalyptic number.

64636243 is a deficient number, since it is larger than the sum of its proper divisors (10552913).

64636243 is a wasteful number, since it uses less digits than its factorization.

64636243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319121 (or 1319114 counting only the distinct ones).

The product of its digits is 62208, while the sum is 34.

The square root of 64636243 is about 8039.6668463314. Note that the first 3 decimals coincide. The cubic root of 64636243 is about 401.3211379324.

Adding to 64636243 its reverse (34263646), we get a palindrome (98899889).

The spelling of 64636243 in words is "sixty-four million, six hundred thirty-six thousand, two hundred forty-three".