646828646 has 4 divisors (see below), whose sum is σ = 970242972. Its totient is φ = 323414322.

The previous prime is 646828627. The next prime is 646828657.

646828646 is nontrivially palindromic in base 10.

646828646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 646828594 and 646828603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161707160 + ... + 161707163.

It is an arithmetic number, because the mean of its divisors is an integer number (242560743).

Almost surely, 2^646828646 is an apocalyptic number.

646828646 is a deficient number, since it is larger than the sum of its proper divisors (323414326).

646828646 is a wasteful number, since it uses less digits than its factorization.

646828646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323414325.

The product of its digits is 2654208, while the sum is 50.

The square root of 646828646 is about 25432.8261504694. The cubic root of 646828646 is about 864.8280126281.

The spelling of 646828646 in words is "six hundred forty-six million, eight hundred twenty-eight thousand, six hundred forty-six".