647494228 has 12 divisors (see below), whose sum is σ = 1163739892. Its totient is φ = 314997120.

The previous prime is 647494213. The next prime is 647494247. The reversal of 647494228 is 822494746.

It can be written as a sum of positive squares in 2 ways, for example, as 546250384 + 101243844 = 23372^2 + 10062^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2187333 + ... + 2187628.

Almost surely, 2^647494228 is an apocalyptic number.

It is an amenable number.

647494228 is a deficient number, since it is larger than the sum of its proper divisors (516245664).

647494228 is a wasteful number, since it uses less digits than its factorization.

647494228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4375002 (or 4375000 counting only the distinct ones).

The product of its digits is 774144, while the sum is 46.

The square root of 647494228 is about 25445.9078831941. The cubic root of 647494228 is about 865.1245448655.

The spelling of 647494228 in words is "six hundred forty-seven million, four hundred ninety-four thousand, two hundred twenty-eight".