646164 has 48 divisors (see below), whose sum is σ = 1738240. Its totient is φ = 207360.

The previous prime is 646159. The next prime is 646169. The reversal of 646164 is 461646.

646164 is a `hidden beast` number, since 646 + 16 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (646159) and next prime (646169).

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646164.

It is not an unprimeable number, because it can be changed into a prime (646169) by changing a digit.

646164 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 15 ways as a sum of consecutive naturals, for example, 3252 + ... + 3444.

2⁶⁴⁶¹⁶⁴ 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 646164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (869120).

646164 is an abundant number, since it is smaller than the sum of its proper divisors (1092076).

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

646164 is a wasteful number, since it uses less digits than its factorization.

646164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 229 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 646164 is about 803.8432683055. The cubic root of 646164 is about 86.4531694340.

646164 divided by its sum of digits (27) gives a palindrome (23932).

It can be divided in two parts, 64616 and 4, that added together give a triangular number (64620 = T₃₅₉).

The spelling of 646164 in words is "six hundred forty-six thousand, one hundred sixty-four".