64513237 has 4 divisors (see below), whose sum is σ = 66256876. Its totient is φ = 62769600.

The previous prime is 64513219. The next prime is 64513247. The reversal of 64513237 is 73231546.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44209201 + 20304036 = 6649^2 + 4506^2 .

It is a cyclic number.

It is not a de Polignac number, because 64513237 - 2¹⁵ = 64480469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64513199 and 64513208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64513247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871764 + ... + 871837.

It is an arithmetic number, because the mean of its divisors is an integer number (16564219).

Almost surely, 2^64513237 is an apocalyptic number.

It is an amenable number.

64513237 is a deficient number, since it is larger than the sum of its proper divisors (1743639).

64513237 is a wasteful number, since it uses less digits than its factorization.

64513237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743638.

The product of its digits is 15120, while the sum is 31.

The square root of 64513237 is about 8032.0132594512. The cubic root of 64513237 is about 401.0663982107.

The spelling of 64513237 in words is "sixty-four million, five hundred thirteen thousand, two hundred thirty-seven".