646225344 has 112 divisors (see below), whose sum is σ = 1906828800. Its totient is φ = 214610688.

The previous prime is 646225339. The next prime is 646225379. The reversal of 646225344 is 443522646.

646225344 is a `hidden beast` number, since 64 + 62 + 2 + 534 + 4 = 666.

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 = 646225299 and 646225308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 633667 + ... + 634685.

Almost surely, 2^646225344 is an apocalyptic number.

646225344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646225344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (953414400).

646225344 is an abundant number, since it is smaller than the sum of its proper divisors (1260603456).

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

646225344 is a wasteful number, since it uses less digits than its factorization.

646225344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407 (or 1391 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 646225344 is about 25420.9626883012. The cubic root of 646225344 is about 864.5590517674.

The spelling of 646225344 in words is "six hundred forty-six million, two hundred twenty-five thousand, three hundred forty-four".