646953408 has 84 divisors (see below), whose sum is σ = 1885904280. Its totient is φ = 211984896.

The previous prime is 646953397. The next prime is 646953409. The reversal of 646953408 is 804359646.

646953408 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 (646953409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24466 + ... + 43502.

Almost surely, 2^646953408 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 646953408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (942952140).

646953408 is an abundant number, since it is smaller than the sum of its proper divisors (1238950872).

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

646953408 is a wasteful number, since it uses less digits than its factorization.

646953408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19114 (or 19101 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 646953408 is about 25435.2788072001. The cubic root of 646953408 is about 864.8836124827.

The spelling of 646953408 in words is "six hundred forty-six million, nine hundred fifty-three thousand, four hundred eight".