64944736 has 48 divisors (see below), whose sum is σ = 135475200. Its totient is φ = 30561408.

The previous prime is 64944703. The next prime is 64944787. The reversal of 64944736 is 63744946.

It is a junction number, because it is equal to n+sod(n) for n = 64944692 and 64944701.

It is a congruent number.

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, 135345 + ... + 135823.

It is an arithmetic number, because the mean of its divisors is an integer number (2822400).

Almost surely, 2^64944736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64944736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67737600).

64944736 is an abundant number, since it is smaller than the sum of its proper divisors (70530464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64944736 is a wasteful number, since it uses less digits than its factorization.

64944736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731 (or 723 counting only the distinct ones).

The product of its digits is 435456, while the sum is 43.

The square root of 64944736 is about 8058.8296917108. The cubic root of 64944736 is about 401.9585941199.

The spelling of 64944736 in words is "sixty-four million, nine hundred forty-four thousand, seven hundred thirty-six".