64645033 has 4 divisors (see below), whose sum is σ = 68447700. Its totient is φ = 60842368.

The previous prime is 64645027. The next prime is 64645037. The reversal of 64645033 is 33054646.

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 53173264 + 11471769 = 7292^2 + 3387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64645033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64644986 and 64645004.

It is not an unprimeable number, because it can be changed into a prime (64645037) 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, 1901308 + ... + 1901341.

It is an arithmetic number, because the mean of its divisors is an integer number (17111925).

Almost surely, 2^64645033 is an apocalyptic number.

It is an amenable number.

64645033 is a deficient number, since it is larger than the sum of its proper divisors (3802667).

64645033 is a wasteful number, since it uses less digits than its factorization.

64645033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3802666.

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 64645033 is about 8040.2134921904. The cubic root of 64645033 is about 401.3393292378.

Adding to 64645033 its reverse (33054646), we get a palindrome (97699679).

The spelling of 64645033 in words is "sixty-four million, six hundred forty-five thousand, thirty-three".