647880 has 32 divisors (see below), whose sum is σ = 1944000. Its totient is φ = 172736.

The previous prime is 647861. The next prime is 647891. The reversal of 647880 is 88746.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647880.

It is an unprimeable number.

647880 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 in 7 ways as a sum of consecutive naturals, for example, 2580 + ... + 2819.

It is an arithmetic number, because the mean of its divisors is an integer number (60750).

2⁶⁴⁷⁸⁸⁰ is an apocalyptic number.

647880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

647880 is an abundant number, since it is smaller than the sum of its proper divisors (1296120).

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

647880 is a wasteful number, since it uses less digits than its factorization.

647880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5413 (or 5409 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 647880 is about 804.9099328496. The cubic root of 647880 is about 86.5296322236.

The spelling of 647880 in words is "six hundred forty-seven thousand, eight hundred eighty".