646145344 has 56 divisors (see below), whose sum is σ = 1404335520. Its totient is φ = 293144064.

The previous prime is 646145323. The next prime is 646145359. The reversal of 646145344 is 443541646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42507 + ... + 55669.

It is an arithmetic number, because the mean of its divisors is an integer number (25077420).

Almost surely, 2^646145344 is an apocalyptic number.

646145344 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 646145344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (702167760).

646145344 is an abundant number, since it is smaller than the sum of its proper divisors (758190176).

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

646145344 is a wasteful number, since it uses less digits than its factorization.

646145344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13247 (or 13237 counting only the distinct ones).

The product of its digits is 138240, while the sum is 37.

The square root of 646145344 is about 25419.3891350677. The cubic root of 646145344 is about 864.5233740279.

The spelling of 646145344 in words is "six hundred forty-six million, one hundred forty-five thousand, three hundred forty-four".