646724472 has 128 divisors (see below), whose sum is σ = 1770024960. Its totient is φ = 196116480.

The previous prime is 646724471. The next prime is 646724473. The reversal of 646724472 is 274427646.

It is a happy number.

646724472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (646724471) and next prime (646724473).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646724471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3350808 + ... + 3351000.

It is an arithmetic number, because the mean of its divisors is an integer number (13828320).

Almost surely, 2^646724472 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 646724472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (885012480).

646724472 is an abundant number, since it is smaller than the sum of its proper divisors (1123300488).

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

646724472 is a wasteful number, since it uses less digits than its factorization.

646724472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453 (or 449 counting only the distinct ones).

The product of its digits is 451584, while the sum is 42.

The square root of 646724472 is about 25430.7780455101. The cubic root of 646724472 is about 864.7815822837.

The spelling of 646724472 in words is "six hundred forty-six million, seven hundred twenty-four thousand, four hundred seventy-two".