647888 has 10 divisors (see below), whose sum is σ = 1255314. Its totient is φ = 323936.

The previous prime is 647861. The next prime is 647891. The reversal of 647888 is 888746.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 425104 + 222784 = 652^2 + 472^2 .

It is a congruent number.

It is an unprimeable number.

647888 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20231 + ... + 20262.

2⁶⁴⁷⁸⁸⁸ is an apocalyptic number.

It is an amenable number.

647888 is a deficient number, since it is larger than the sum of its proper divisors (607426).

647888 is a wasteful number, since it uses less digits than its factorization.

647888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40501 (or 40495 counting only the distinct ones).

The product of its digits is 86016, while the sum is 41.

The square root of 647888 is about 804.9149023344. The cubic root of 647888 is about 86.5299883771.

The spelling of 647888 in words is "six hundred forty-seven thousand, eight hundred eighty-eight".