646389432 has 96 divisors (see below), whose sum is σ = 1946206080. Its totient is φ = 192464640.

The previous prime is 646389409. The next prime is 646389437. The reversal of 646389432 is 234983646.

646389432 is a `hidden beast` number, since 6 + 4 + 638 + 9 + 4 + 3 + 2 = 666.

646389432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646389437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17878 + ... + 40154.

It is an arithmetic number, because the mean of its divisors is an integer number (20272980).

Almost surely, 2^646389432 is an apocalyptic number.

646389432 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646389432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973103040).

646389432 is an abundant number, since it is smaller than the sum of its proper divisors (1299816648).

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

646389432 is a wasteful number, since it uses less digits than its factorization.

646389432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22333 (or 22326 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 646389432 is about 25424.1898985985. The cubic root of 646389432 is about 864.6322211664.

The spelling of 646389432 in words is "six hundred forty-six million, three hundred eighty-nine thousand, four hundred thirty-two".