646047727 has 4 divisors (see below), whose sum is σ = 695743720. Its totient is φ = 596351736.

The previous prime is 646047679. The next prime is 646047733. The reversal of 646047727 is 727740646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 727740646 = 2 ⋅363870323.

It is a cyclic number.

It is not a de Polignac number, because 646047727 - 2¹⁵ = 646014959 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 (646047757) 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, 24847977 + ... + 24848002.

It is an arithmetic number, because the mean of its divisors is an integer number (173935930).

Almost surely, 2^646047727 is an apocalyptic number.

646047727 is a deficient number, since it is larger than the sum of its proper divisors (49695993).

646047727 is a wasteful number, since it uses less digits than its factorization.

646047727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49695992.

The product of its (nonzero) digits is 395136, while the sum is 43.

The square root of 646047727 is about 25417.4689337865. The cubic root of 646047727 is about 864.4798356150.

The spelling of 646047727 in words is "six hundred forty-six million, forty-seven thousand, seven hundred twenty-seven".