646512 has 20 divisors (see below), whose sum is σ = 1670280. Its totient is φ = 215488.

The previous prime is 646453. The next prime is 646519. The reversal of 646512 is 215646.

It is a super-2 number, since 2×646512² = 835955532288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 646512.

It is not an unprimeable number, because it can be changed into a prime (646519) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6687 + ... + 6782.

It is an arithmetic number, because the mean of its divisors is an integer number (83514).

2⁶⁴⁶⁵¹² is an apocalyptic number.

It is an amenable number.

646512 is an abundant number, since it is smaller than the sum of its proper divisors (1023768).

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

646512 is a wasteful number, since it uses less digits than its factorization.

646512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13480 (or 13474 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 646512 is about 804.0596992761. The cubic root of 646512 is about 86.4686868071.

The spelling of 646512 in words is "six hundred forty-six thousand, five hundred twelve".