646823052 has 72 divisors (see below), whose sum is σ = 1679998320. Its totient is φ = 209710080.

The previous prime is 646823041. The next prime is 646823053. The reversal of 646823052 is 250328646.

646823052 is a `hidden beast` number, since 646 + 8 + 2 + 3 + 0 + 5 + 2 = 666.

646823052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 646822998 and 646823016.

It is not an unprimeable number, because it can be changed into a prime (646823053) 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, 874899 + ... + 875637.

It is an arithmetic number, because the mean of its divisors is an integer number (23333310).

Almost surely, 2^646823052 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 646823052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (839999160).

646823052 is an abundant number, since it is smaller than the sum of its proper divisors (1033175268).

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

646823052 is a wasteful number, since it uses less digits than its factorization.

646823052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383 (or 1378 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 646823052 is about 25432.7161742508. The cubic root of 646823052 is about 864.8255195093.

The spelling of 646823052 in words is "six hundred forty-six million, eight hundred twenty-three thousand, fifty-two".