647688 has 16 divisors (see below), whose sum is σ = 1619280. Its totient is φ = 215888.

The previous prime is 647687. The next prime is 647693. The reversal of 647688 is 886746.

It is not an unprimeable number, because it can be changed into a prime (647687) by changing a digit.

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, 13470 + ... + 13517.

It is an arithmetic number, because the mean of its divisors is an integer number (101205).

2⁶⁴⁷⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

647688 is an abundant number, since it is smaller than the sum of its proper divisors (971592).

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

647688 is a wasteful number, since it uses less digits than its factorization.

647688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26996 (or 26992 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 647688 is about 804.7906560094. The cubic root of 647688 is about 86.5210836597.

The spelling of 647688 in words is "six hundred forty-seven thousand, six hundred eighty-eight".