646376375 has 8 divisors (see below), whose sum is σ = 806677872. Its totient is φ = 517101000.

The previous prime is 646376351. The next prime is 646376377. The reversal of 646376375 is 573673646.

It is not a de Polignac number, because 646376375 - 2¹⁰ = 646375351 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 (646376377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2585381 + ... + 2585630.

It is an arithmetic number, because the mean of its divisors is an integer number (100834734).

Almost surely, 2^646376375 is an apocalyptic number.

646376375 is a deficient number, since it is larger than the sum of its proper divisors (160301497).

646376375 is an equidigital number, since it uses as much as digits as its factorization.

646376375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5171026 (or 5171016 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 47.

The square root of 646376375 is about 25423.9331142921. The cubic root of 646376375 is about 864.6263992999.

The spelling of 646376375 in words is "six hundred forty-six million, three hundred seventy-six thousand, three hundred seventy-five".