647755 has 8 divisors (see below), whose sum is σ = 781632. Its totient is φ = 515328.

The previous prime is 647753. The next prime is 647771. The reversal of 647755 is 557746.

647755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 647755 - 2¹ = 647753 is a prime.

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 647755.

It is not an unprimeable number, because it can be changed into a prime (647753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1582 + ... + 1948.

It is an arithmetic number, because the mean of its divisors is an integer number (97704).

2⁶⁴⁷⁷⁵⁵ is an apocalyptic number.

647755 is a deficient number, since it is larger than the sum of its proper divisors (133877).

647755 is a wasteful number, since it uses less digits than its factorization.

647755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725.

The product of its digits is 29400, while the sum is 34.

The square root of 647755 is about 804.8322806647. The cubic root of 647755 is about 86.5240669442.

Subtracting from 647755 its reverse (557746), we obtain a palindrome (90009).

The spelling of 647755 in words is "six hundred forty-seven thousand, seven hundred fifty-five".