64449684 has 36 divisors (see below), whose sum is σ = 175447636. Its totient is φ = 19830528.

The previous prime is 64449683. The next prime is 64449719. The reversal of 64449684 is 48694446.

It can be written as a sum of positive squares in 2 ways, for example, as 9363600 + 55086084 = 3060^2 + 7422^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64449683) 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, 68389 + ... + 69324.

Almost surely, 2^64449684 is an apocalyptic number.

It is an amenable number.

64449684 is an abundant number, since it is smaller than the sum of its proper divisors (110997952).

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

64449684 is a wasteful number, since it uses less digits than its factorization.

64449684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137736 (or 137731 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 64449684 is about 8028.0560536160. The cubic root of 64449684 is about 400.9346560110.

The spelling of 64449684 in words is "sixty-four million, four hundred forty-nine thousand, six hundred eighty-four".