64664432 has 80 divisors (see below), whose sum is σ = 151895040. Its totient is φ = 26078976.

The previous prime is 64664417. The next prime is 64664437. The reversal of 64664432 is 23446646.

It is a junction number, because it is equal to n+sod(n) for n = 64664392 and 64664401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64664437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139433 + ... + 139895.

It is an arithmetic number, because the mean of its divisors is an integer number (1898688).

Almost surely, 2^64664432 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 64664432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75947520).

64664432 is an abundant number, since it is smaller than the sum of its proper divisors (87230608).

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

64664432 is a wasteful number, since it uses less digits than its factorization.

64664432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550 (or 544 counting only the distinct ones).

The product of its digits is 82944, while the sum is 35.

The square root of 64664432 is about 8041.4197751392. The cubic root of 64664432 is about 401.3794705172.

The spelling of 64664432 in words is "sixty-four million, six hundred sixty-four thousand, four hundred thirty-two".