647672171 has 16 divisors (see below), whose sum is σ = 722892960. Its totient is φ = 576668160.

The previous prime is 647672147. The next prime is 647672213. The reversal of 647672171 is 171276746.

It is a cyclic number.

It is not a de Polignac number, because 647672171 - 2²⁶ = 580563307 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647672101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 398741 + ... + 400361.

It is an arithmetic number, because the mean of its divisors is an integer number (45180810).

Almost surely, 2^647672171 is an apocalyptic number.

647672171 is a deficient number, since it is larger than the sum of its proper divisors (75220789).

647672171 is a wasteful number, since it uses less digits than its factorization.

647672171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894.

The product of its digits is 98784, while the sum is 41.

The square root of 647672171 is about 25449.4041384076. The cubic root of 647672171 is about 865.2037881752.

The spelling of 647672171 in words is "six hundred forty-seven million, six hundred seventy-two thousand, one hundred seventy-one".