646224032 has 24 divisors (see below), whose sum is σ = 1289686356. Its totient is φ = 318684672.

The previous prime is 646224013. The next prime is 646224079. The reversal of 646224032 is 230422646.

It can be written as a sum of positive squares in 2 ways, for example, as 585446416 + 60777616 = 24196^2 + 7796^2 .

It is a junction number, because it is equal to n+sod(n) for n = 646223986 and 646224004.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135983 + ... + 140654.

Almost surely, 2^646224032 is an apocalyptic number.

It is an amenable number.

646224032 is a deficient number, since it is larger than the sum of its proper divisors (643462324).

646224032 is a wasteful number, since it uses less digits than its factorization.

646224032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276720 (or 276712 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 646224032 is about 25420.9368828137. The cubic root of 646224032 is about 864.5584666762.

Adding to 646224032 its reverse (230422646), we get a palindrome (876646678).

The spelling of 646224032 in words is "six hundred forty-six million, two hundred twenty-four thousand, thirty-two".