64438225 has 12 divisors (see below), whose sum is σ = 80803980. Its totient is φ = 50969600.

The previous prime is 64438223. The next prime is 64438229. The reversal of 64438225 is 52283446.

It can be written as a sum of positive squares in 6 ways, for example, as 69696 + 64368529 = 264^2 + 8023^2 .

It is not a de Polignac number, because 64438225 - 2¹ = 64438223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64438223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12256 + ... + 16705.

It is an arithmetic number, because the mean of its divisors is an integer number (6733665).

Almost surely, 2^64438225 is an apocalyptic number.

It is an amenable number.

64438225 is a deficient number, since it is larger than the sum of its proper divisors (16365755).

64438225 is a wasteful number, since it uses less digits than its factorization.

64438225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29060 (or 29055 counting only the distinct ones).

The product of its digits is 46080, while the sum is 34.

The square root of 64438225 is about 8027.3423372870. The cubic root of 64438225 is about 400.9108928609.

The spelling of 64438225 in words is "sixty-four million, four hundred thirty-eight thousand, two hundred twenty-five".