646378324 has 6 divisors (see below), whose sum is σ = 1131162074. Its totient is φ = 323189160.

The previous prime is 646378321. The next prime is 646378339. The reversal of 646378324 is 423873646.

It is a happy number.

646378324 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 534441924 + 111936400 = 23118^2 + 10580^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646378321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80797287 + ... + 80797294.

Almost surely, 2^646378324 is an apocalyptic number.

It is an amenable number.

646378324 is a deficient number, since it is larger than the sum of its proper divisors (484783750).

646378324 is a wasteful number, since it uses less digits than its factorization.

646378324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161594585 (or 161594583 counting only the distinct ones).

The product of its digits is 580608, while the sum is 43.

The square root of 646378324 is about 25423.9714442886. The cubic root of 646378324 is about 864.6272683267.

The spelling of 646378324 in words is "six hundred forty-six million, three hundred seventy-eight thousand, three hundred twenty-four".