646612 has 24 divisors (see below), whose sum is σ = 1235304. Its totient is φ = 294912.

The previous prime is 646609. The next prime is 646619. The reversal of 646612 is 216646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 512656 + 133956 = 716^2 + 366^2 .

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2388 + ... + 2644.

It is an arithmetic number, because the mean of its divisors is an integer number (51471).

2⁶⁴⁶⁶¹² is an apocalyptic number.

It is an amenable number.

646612 is a deficient number, since it is larger than the sum of its proper divisors (588692).

646612 is a wasteful number, since it uses less digits than its factorization.

646612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 313 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 646612 is about 804.1218813090. The cubic root of 646612 is about 86.4731447923.

The spelling of 646612 in words is "six hundred forty-six thousand, six hundred twelve".