646488 has 64 divisors (see below), whose sum is σ = 1864800. Its totient is φ = 207360.

The previous prime is 646453. The next prime is 646519. The reversal of 646488 is 884646.

646488 is a `hidden beast` number, since 6 + 4 + 648 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

646488 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 15 ways as a sum of consecutive naturals, for example, 8820 + ... + 8892.

2⁶⁴⁶⁴⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (932400).

646488 is an abundant number, since it is smaller than the sum of its proper divisors (1218312).

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

646488 is a wasteful number, since it uses less digits than its factorization.

646488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 119 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 646488 is about 804.0447748726. The cubic root of 646488 is about 86.4676168222.

The spelling of 646488 in words is "six hundred forty-six thousand, four hundred eighty-eight".