646272017 has 24 divisors (see below), whose sum is σ = 710806176. Its totient is φ = 585408384.

The previous prime is 646271999. The next prime is 646272019. The reversal of 646272017 is 710272646.

It is not a de Polignac number, because 646272017 - 2²² = 642077713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646272019) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 3964778 + ... + 3964940.

It is an arithmetic number, because the mean of its divisors is an integer number (29616924).

Almost surely, 2^646272017 is an apocalyptic number.

646272017 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

646272017 is a deficient number, since it is larger than the sum of its proper divisors (64534159).

646272017 is a wasteful number, since it uses less digits than its factorization.

646272017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 646272017 is about 25421.8806739391. The cubic root of 646272017 is about 864.5798652466.

The spelling of 646272017 in words is "six hundred forty-six million, two hundred seventy-two thousand, seventeen".