647329 has 4 divisors (see below), whose sum is σ = 650160. Its totient is φ = 644500.

The previous prime is 647327. The next prime is 647333. The reversal of 647329 is 923746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647329 - 2¹ = 647327 is a prime.

It is a Smith number, since the sum of its digits (31) 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 a self number, because there is not a number n which added to its sum of digits gives 647329.

It is not an unprimeable number, because it can be changed into a prime (647321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1039 + ... + 1540.

It is an arithmetic number, because the mean of its divisors is an integer number (162540).

2⁶⁴⁷³²⁹ is an apocalyptic number.

It is an amenable number.

647329 is a deficient number, since it is larger than the sum of its proper divisors (2831).

647329 is a wasteful number, since it uses less digits than its factorization.

647329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830.

The product of its digits is 9072, while the sum is 31.

The square root of 647329 is about 804.5675857254. The cubic root of 647329 is about 86.5050950923.

The spelling of 647329 in words is "six hundred forty-seven thousand, three hundred twenty-nine".