64834644 has 72 divisors (see below), whose sum is σ = 178573248. Its totient is φ = 18251520.

The previous prime is 64834613. The next prime is 64834657. The reversal of 64834644 is 44643846.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40972 + ... + 42524.

It is an arithmetic number, because the mean of its divisors is an integer number (2480184).

Almost surely, 2^64834644 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 64834644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89286624).

64834644 is an abundant number, since it is smaller than the sum of its proper divisors (113738604).

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

64834644 is a wasteful number, since it uses less digits than its factorization.

64834644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645 (or 1636 counting only the distinct ones).

The product of its digits is 221184, while the sum is 39.

The square root of 64834644 is about 8051.9962742167. The cubic root of 64834644 is about 401.7313370349.

The spelling of 64834644 in words is "sixty-four million, eight hundred thirty-four thousand, six hundred forty-four".