64440252 has 24 divisors (see below), whose sum is σ = 167067600. Its totient is φ = 21480048.

The previous prime is 64440247. The next prime is 64440253. The reversal of 64440252 is 25204446.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64440253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298227 + ... + 298442.

It is an arithmetic number, because the mean of its divisors is an integer number (6961150).

Almost surely, 2^64440252 is an apocalyptic number.

It is an amenable number.

64440252 is an abundant number, since it is smaller than the sum of its proper divisors (102627348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64440252 is a wasteful number, since it uses less digits than its factorization.

64440252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596682 (or 596674 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 64440252 is about 8027.4685922774. The cubic root of 64440252 is about 400.9150965659.

Adding to 64440252 its reverse (25204446), we get a palindrome (89644698).

The spelling of 64440252 in words is "sixty-four million, four hundred forty thousand, two hundred fifty-two".