64645253 has 4 divisors (see below), whose sum is σ = 66392460. Its totient is φ = 62898048.

The previous prime is 64645241. The next prime is 64645279. The reversal of 64645253 is 35254646.

It is a happy number.

64645253 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.

It can be written as a sum of positive squares in 2 ways, for example, as 24930049 + 39715204 = 4993^2 + 6302^2 .

It is a cyclic number.

It is not a de Polignac number, because 64645253 - 2⁸ = 64644997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64641253) 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, 873548 + ... + 873621.

It is an arithmetic number, because the mean of its divisors is an integer number (16598115).

Almost surely, 2^64645253 is an apocalyptic number.

It is an amenable number.

64645253 is a deficient number, since it is larger than the sum of its proper divisors (1747207).

64645253 is a wasteful number, since it uses less digits than its factorization.

64645253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747206.

The product of its digits is 86400, while the sum is 35.

The square root of 64645253 is about 8040.2271734075. The cubic root of 64645253 is about 401.3397845167.

Adding to 64645253 its reverse (35254646), we get a palindrome (99899899).

The spelling of 64645253 in words is "sixty-four million, six hundred forty-five thousand, two hundred fifty-three".