64445636 has 24 divisors (see below), whose sum is σ = 114754080. Its totient is φ = 31663872.

The previous prime is 64445617. The next prime is 64445651. The reversal of 64445636 is 63654446.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 64445636.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62735 + ... + 63753.

It is an arithmetic number, because the mean of its divisors is an integer number (4781420).

Almost surely, 2^64445636 is an apocalyptic number.

It is an amenable number.

64445636 is a deficient number, since it is larger than the sum of its proper divisors (50308444).

64445636 is a wasteful number, since it uses less digits than its factorization.

64445636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283 (or 1281 counting only the distinct ones).

The product of its digits is 207360, while the sum is 38.

The square root of 64445636 is about 8027.8039338290. The cubic root of 64445636 is about 400.9262617755.

The spelling of 64445636 in words is "sixty-four million, four hundred forty-five thousand, six hundred thirty-six".