64444438 has 16 divisors (see below), whose sum is σ = 100440000. Its totient is φ = 30974272.

The previous prime is 64444427. The next prime is 64444439. The reversal of 64444438 is 83444446.

It is a junction number, because it is equal to n+sod(n) for n = 64444397 and 64444406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64444439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11538 + ... + 16186.

It is an arithmetic number, because the mean of its divisors is an integer number (6277500).

Almost surely, 2^64444438 is an apocalyptic number.

64444438 is a deficient number, since it is larger than the sum of its proper divisors (35995562).

64444438 is a wasteful number, since it uses less digits than its factorization.

64444438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4919.

The product of its digits is 147456, while the sum is 37.

The square root of 64444438 is about 8027.7293178084. The cubic root of 64444438 is about 400.9237774457.

It can be divided in two parts, 6 and 4444438, that added together give a palindrome (4444444).

The spelling of 64444438 in words is "sixty-four million, four hundred forty-four thousand, four hundred thirty-eight".