647972 has 24 divisors (see below), whose sum is σ = 1294776. Its totient is φ = 281088.

The previous prime is 647963. The next prime is 647987. The reversal of 647972 is 279746.

It can be written as a sum of positive squares in 4 ways, for example, as 246016 + 401956 = 496^2 + 634^2 .

It is a congruent number.

It is an unprimeable number.

647972 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518 + ... + 1250.

It is an arithmetic number, because the mean of its divisors is an integer number (53949).

2⁶⁴⁷⁹⁷² is an apocalyptic number.

It is an amenable number.

647972 is a deficient number, since it is larger than the sum of its proper divisors (646804).

647972 is a wasteful number, since it uses less digits than its factorization.

647972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767 (or 765 counting only the distinct ones).

The product of its digits is 21168, while the sum is 35.

The square root of 647972 is about 804.9670800722. The cubic root of 647972 is about 86.5337278120.

The spelling of 647972 in words is "six hundred forty-seven thousand, nine hundred seventy-two".