647312 has 20 divisors (see below), whose sum is σ = 1309440. Its totient is φ = 309408.

The previous prime is 647303. The next prime is 647321. The reversal of 647312 is 213746.

It is an interprime number because it is at equal distance from previous prime (647303) and next prime (647321).

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512 + ... + 1247.

It is an arithmetic number, because the mean of its divisors is an integer number (65472).

2⁶⁴⁷³¹² is an apocalyptic number.

It is an amenable number.

647312 is an abundant number, since it is smaller than the sum of its proper divisors (662128).

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

647312 is a wasteful number, since it uses less digits than its factorization.

647312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790 (or 1784 counting only the distinct ones).

The product of its digits is 1008, while the sum is 23.

The square root of 647312 is about 804.5570209749. The cubic root of 647312 is about 86.5043378269.

It can be divided in two parts, 647 and 312, that added together give a palindrome (959).

The spelling of 647312 in words is "six hundred forty-seven thousand, three hundred twelve".