647768 has 32 divisors (see below), whose sum is σ = 1406160. Its totient is φ = 276480.

The previous prime is 647753. The next prime is 647771. The reversal of 647768 is 867746.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1280 + ... + 1712.

2⁶⁴⁷⁷⁶⁸ is an apocalyptic number.

647768 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703080).

647768 is an abundant number, since it is smaller than the sum of its proper divisors (758392).

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

647768 is a wasteful number, since it uses less digits than its factorization.

647768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 463 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The square root of 647768 is about 804.8403568410. The cubic root of 647768 is about 86.5246457666.

It can be divided in two parts, 6 and 47768, that added together give a palindrome (47774).

The spelling of 647768 in words is "six hundred forty-seven thousand, seven hundred sixty-eight".