647640227 has 16 divisors (see below), whose sum is σ = 711701760. Its totient is φ = 585684000.

The previous prime is 647640221. The next prime is 647640247. The reversal of 647640227 is 722046746.

It is a cyclic number.

It is not a de Polignac number, because 647640227 - 2⁶ = 647640163 is a prime.

It is a super-2 number, since 2×647640227² = 838875727257223058, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) 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 (647640221) 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, 252602 + ... + 255152.

It is an arithmetic number, because the mean of its divisors is an integer number (44481360).

Almost surely, 2^647640227 is an apocalyptic number.

647640227 is a deficient number, since it is larger than the sum of its proper divisors (64061533).

647640227 is a wasteful number, since it uses less digits than its factorization.

647640227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2954.

The product of its (nonzero) digits is 112896, while the sum is 38.

The square root of 647640227 is about 25448.7765324779. The cubic root of 647640227 is about 865.1895636310.

The spelling of 647640227 in words is "six hundred forty-seven million, six hundred forty thousand, two hundred twenty-seven".