647802 has 48 divisors (see below), whose sum is σ = 1558440. Its totient is φ = 193536.

The previous prime is 647789. The next prime is 647809. The reversal of 647802 is 208746.

It can be written as a sum of positive squares in 4 ways, for example, as 622521 + 25281 = 789^2 + 159^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647802.

It is not an unprimeable number, because it can be changed into a prime (647809) by changing a digit.

647802 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8838 + ... + 8910.

2⁶⁴⁷⁸⁰² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647802, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (779220).

647802 is an abundant number, since it is smaller than the sum of its proper divisors (910638).

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

647802 is a wasteful number, since it uses less digits than its factorization.

647802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 647802 is about 804.8614787651. The cubic root of 647802 is about 86.5261595732.

The spelling of 647802 in words is "six hundred forty-seven thousand, eight hundred two".