646026647 has 4 divisors (see below), whose sum is σ = 738316176. Its totient is φ = 553737120.

The previous prime is 646026643. The next prime is 646026659. The reversal of 646026647 is 746620646.

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 646026647 - 2² = 646026643 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 (646026643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46144754 + ... + 46144767.

It is an arithmetic number, because the mean of its divisors is an integer number (184579044).

Almost surely, 2^646026647 is an apocalyptic number.

646026647 is a deficient number, since it is larger than the sum of its proper divisors (92289529).

646026647 is an equidigital number, since it uses as much as digits as its factorization.

646026647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92289528.

The product of its (nonzero) digits is 290304, while the sum is 41.

The square root of 646026647 is about 25417.0542549683. The cubic root of 646026647 is about 864.4704330934.

The spelling of 646026647 in words is "six hundred forty-six million, twenty-six thousand, six hundred forty-seven".