647225 has 6 divisors (see below), whose sum is σ = 802590. Its totient is φ = 517760.

The previous prime is 647219. The next prime is 647261. The reversal of 647225 is 522746.

It can be written as a sum of positive squares in 3 ways, for example, as 169744 + 477481 = 412^2 + 691^2 .

It is not a de Polignac number, because 647225 - 2⁴ = 647209 is a prime.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 647194 and 647203.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12920 + ... + 12969.

It is an arithmetic number, because the mean of its divisors is an integer number (133765).

2⁶⁴⁷²²⁵ is an apocalyptic number.

It is an amenable number.

647225 is a deficient number, since it is larger than the sum of its proper divisors (155365).

647225 is a wasteful number, since it uses less digits than its factorization.

647225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25899 (or 25894 counting only the distinct ones).

The product of its digits is 3360, while the sum is 26.

The square root of 647225 is about 804.5029521388. The cubic root of 647225 is about 86.5004622025.

It can be divided in two parts, 64722 and 5, that multiplied together give a triangular number (323610 = T₈₀₄).

The spelling of 647225 in words is "six hundred forty-seven thousand, two hundred twenty-five".