64443418 has 24 divisors (see below), whose sum is σ = 107522748. Its totient is φ = 28933632.

The previous prime is 64443403. The next prime is 64443419. The reversal of 64443418 is 81434446.

It can be written as a sum of positive squares in 6 ways, for example, as 26040609 + 38402809 = 5103^2 + 6197^2 .

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (64443419) 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, 9930 + ... + 15082.

Almost surely, 2^64443418 is an apocalyptic number.

64443418 is a deficient number, since it is larger than the sum of its proper divisors (43079330).

64443418 is a wasteful number, since it uses less digits than its factorization.

64443418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5218 (or 5205 counting only the distinct ones).

The product of its digits is 36864, while the sum is 34.

The square root of 64443418 is about 8027.6657877617. The cubic root of 64443418 is about 400.9216622158.

The spelling of 64443418 in words is "sixty-four million, four hundred forty-three thousand, four hundred eighteen".