64564237 has 4 divisors (see below), whose sum is σ = 66790620. Its totient is φ = 62337856.

The previous prime is 64564219. The next prime is 64564271. The reversal of 64564237 is 73246546.

64564237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73246546 = 2 ⋅36623273.

It can be written as a sum of positive squares in 2 ways, for example, as 55145476 + 9418761 = 7426^2 + 3069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64564237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64564196 and 64564205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64564637) 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, 1113148 + ... + 1113205.

It is an arithmetic number, because the mean of its divisors is an integer number (16697655).

Almost surely, 2^64564237 is an apocalyptic number.

It is an amenable number.

64564237 is a deficient number, since it is larger than the sum of its proper divisors (2226383).

64564237 is a wasteful number, since it uses less digits than its factorization.

64564237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2226382.

The product of its digits is 120960, while the sum is 37.

The square root of 64564237 is about 8035.1874278078. The cubic root of 64564237 is about 401.1720561069.

The spelling of 64564237 in words is "sixty-four million, five hundred sixty-four thousand, two hundred thirty-seven".