64247 has 4 divisors (see below), whose sum is σ = 65856. Its totient is φ = 62640.

The previous prime is 64237. The next prime is 64271. The reversal of 64247 is 74246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74246 = 2 ⋅37123.

It is a cyclic number.

It is not a de Polignac number, because 64247 - 2⁴ = 64231 is a prime.

It is a d-powerful number, because it can be written as 6⁶ + 4² + 2⁹ + 4⁴ + 7⁵ .

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 64247.

It is not an unprimeable number, because it can be changed into a prime (64217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743 + ... + 824.

It is an arithmetic number, because the mean of its divisors is an integer number (16464).

2⁶⁴²⁴⁷ is an apocalyptic number.

64247 is a deficient number, since it is larger than the sum of its proper divisors (1609).

64247 is a wasteful number, since it uses less digits than its factorization.

64247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608.

The product of its digits is 1344, while the sum is 23.

The square root of 64247 is about 253.4699193198. The cubic root of 64247 is about 40.0513922759.

Subtracting 64247 from its reverse (74246), we obtain a palindrome (9999).

The spelling of 64247 in words is "sixty-four thousand, two hundred forty-seven".