64216432 has 40 divisors (see below), whose sum is σ = 142848000. Its totient is φ = 27394752.

The previous prime is 64216403. The next prime is 64216433. The reversal of 64216432 is 23461246.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 64216432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64216433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25569 + ... + 27967.

It is an arithmetic number, because the mean of its divisors is an integer number (3571200).

Almost surely, 2^64216432 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 64216432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71424000).

64216432 is an abundant number, since it is smaller than the sum of its proper divisors (78631568).

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

64216432 is a wasteful number, since it uses less digits than its factorization.

64216432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653 (or 2647 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 64216432 is about 8013.5155830634. The cubic root of 64216432 is about 400.4503926758.

Adding to 64216432 its reverse (23461246), we get a palindrome (87677678).

The spelling of 64216432 in words is "sixty-four million, two hundred sixteen thousand, four hundred thirty-two".