646888 has 16 divisors (see below), whose sum is σ = 1323360. Its totient is φ = 294000.

The previous prime is 646883. The next prime is 646889. The reversal of 646888 is 888646.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 646888.

It is not an unprimeable number, because it can be changed into a prime (646883) by changing a digit.

646888 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 3 ways as a sum of consecutive naturals, for example, 3588 + ... + 3763.

It is an arithmetic number, because the mean of its divisors is an integer number (82710).

2⁶⁴⁶⁸⁸⁸ is an apocalyptic number.

It is an amenable number.

646888 is an abundant number, since it is smaller than the sum of its proper divisors (676472).

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

646888 is a wasteful number, since it uses less digits than its factorization.

646888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7368 (or 7364 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 646888 is about 804.2934787750. The cubic root of 646888 is about 86.4854464472.

It can be divided in two parts, 6468 and 88, that added together give a palindrome (6556).

The spelling of 646888 in words is "six hundred forty-six thousand, eight hundred eighty-eight".