64320253 has 4 divisors (see below), whose sum is σ = 64395648. Its totient is φ = 64244860.

The previous prime is 64320241. The next prime is 64320281. The reversal of 64320253 is 35202346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64320253 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 (64320203) 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, 36403 + ... + 38128.

It is an arithmetic number, because the mean of its divisors is an integer number (16098912).

Almost surely, 2^64320253 is an apocalyptic number.

It is an amenable number.

64320253 is a deficient number, since it is larger than the sum of its proper divisors (75395).

64320253 is an equidigital number, since it uses as much as digits as its factorization.

64320253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75394.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 64320253 is about 8019.9908354062. The cubic root of 64320253 is about 400.6660839647. Note that the first 3 decimals are identical.

Adding to 64320253 its reverse (35202346), we get a palindrome (99522599).

The spelling of 64320253 in words is "sixty-four million, three hundred twenty thousand, two hundred fifty-three".