6421745232 has 320 divisors, whose sum is σ = 22121758720. Its totient is φ = 1744934400.

The previous prime is 6421745227. The next prime is 6421745243. The reversal of 6421745232 is 2325471246.

6421745232 is a `hidden beast` number, since 64 + 2 + 1 + 74 + 523 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5717823 + ... + 5718945.

It is an arithmetic number, because the mean of its divisors is an integer number (69130496).

Almost surely, 2^6421745232 is an apocalyptic number.

6421745232 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 6421745232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11060879360).

6421745232 is an abundant number, since it is smaller than the sum of its proper divisors (15700013488).

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

6421745232 is a wasteful number, since it uses less digits than its factorization.

6421745232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239 (or 1227 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 6421745232 is about 80135.7924525614. The cubic root of 6421745232 is about 1858.7359152967.

The spelling of 6421745232 in words is "six billion, four hundred twenty-one million, seven hundred forty-five thousand, two hundred thirty-two".