647028 has 30 divisors (see below), whose sum is σ = 1692306. Its totient is φ = 215568.

The previous prime is 647011. The next prime is 647033. The reversal of 647028 is 820746.

It can be written as a sum of positive squares in only one way, i.e., 374544 + 272484 = 612^2 + 522^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 646992 and 647010.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647028.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 675 + ... + 1322.

2⁶⁴⁷⁰²⁸ is an apocalyptic number.

It is an amenable number.

647028 is an abundant number, since it is smaller than the sum of its proper divisors (1045278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647028 is a wasteful number, since it uses less digits than its factorization.

647028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013 (or 2002 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 647028 is about 804.3805069742. The cubic root of 647028 is about 86.4916850795.

The spelling of 647028 in words is "six hundred forty-seven thousand, twenty-eight".