647655 has 8 divisors (see below), whose sum is σ = 1036272. Its totient is φ = 345408.

The previous prime is 647651. The next prime is 647659. The reversal of 647655 is 556746.

It is an interprime number because it is at equal distance from previous prime (647651) and next prime (647659).

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

It is not a de Polignac number, because 647655 - 2² = 647651 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647655.

It is not an unprimeable number, because it can be changed into a prime (647651) 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, 21574 + ... + 21603.

It is an arithmetic number, because the mean of its divisors is an integer number (129534).

2⁶⁴⁷⁶⁵⁵ is an apocalyptic number.

647655 is a deficient number, since it is larger than the sum of its proper divisors (388617).

647655 is a wasteful number, since it uses less digits than its factorization.

647655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43185.

The product of its digits is 25200, while the sum is 33.

The square root of 647655 is about 804.7701535221. The cubic root of 647655 is about 86.5196142051.

Subtracting from 647655 its reverse (556746), we obtain a palindrome (90909).

The spelling of 647655 in words is "six hundred forty-seven thousand, six hundred fifty-five".