64444225 has 12 divisors (see below), whose sum is σ = 81267120. Its totient is φ = 50680400.

The previous prime is 64444213. The next prime is 64444231. The reversal of 64444225 is 52244446.

It is a happy number.

It is not a de Polignac number, because 64444225 - 2¹⁹ = 63919937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20371 + ... + 23320.

It is an arithmetic number, because the mean of its divisors is an integer number (6772260).

Almost surely, 2^64444225 is an apocalyptic number.

It is an amenable number.

64444225 is a deficient number, since it is larger than the sum of its proper divisors (16822895).

64444225 is a wasteful number, since it uses less digits than its factorization.

64444225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43760 (or 43755 counting only the distinct ones).

The product of its digits is 30720, while the sum is 31.

The square root of 64444225 is about 8027.7160512813. The cubic root of 64444225 is about 400.9233357378.

The spelling of 64444225 in words is "sixty-four million, four hundred forty-four thousand, two hundred twenty-five".