646378327 has 4 divisors (see below), whose sum is σ = 738718096. Its totient is φ = 554038560.

The previous prime is 646378321. The next prime is 646378339. The reversal of 646378327 is 723873646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646378327 - 2¹⁹ = 645854039 is a prime.

It is a Duffinian number.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46169874 + ... + 46169887.

It is an arithmetic number, because the mean of its divisors is an integer number (184679524).

Almost surely, 2^646378327 is an apocalyptic number.

646378327 is a deficient number, since it is larger than the sum of its proper divisors (92339769).

646378327 is an equidigital number, since it uses as much as digits as its factorization.

646378327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92339768.

The product of its digits is 1016064, while the sum is 46.

The square root of 646378327 is about 25423.9715032880. The cubic root of 646378327 is about 864.6272696644.

It can be divided in two parts, 6463783 and 27, that added together give a triangular number (6463810 = T₃₅₉₅).

The spelling of 646378327 in words is "six hundred forty-six million, three hundred seventy-eight thousand, three hundred twenty-seven".