646647606 has 48 divisors (see below), whose sum is σ = 1530704448. Its totient is φ = 195663600.

The previous prime is 646647587. The next prime is 646647607. The reversal of 646647606 is 606746646.

646647606 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646647607) 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, 158565 + ... + 162591.

It is an arithmetic number, because the mean of its divisors is an integer number (31889676).

Almost surely, 2^646647606 is an apocalyptic number.

646647606 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

646647606 is an abundant number, since it is smaller than the sum of its proper divisors (884056842).

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

646647606 is a wasteful number, since it uses less digits than its factorization.

646647606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4857 (or 4854 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 45.

The square root of 646647606 is about 25429.2667216340. The cubic root of 646647606 is about 864.7473199161.

The spelling of 646647606 in words is "six hundred forty-six million, six hundred forty-seven thousand, six hundred six".