646695 has 24 divisors (see below), whose sum is σ = 1281696. Its totient is φ = 295488.

The previous prime is 646687. The next prime is 646721. The reversal of 646695 is 596646.

It is a happy number.

646695 is a `hidden beast` number, since 646 + 6 + 9 + 5 = 666.

It is not a de Polignac number, because 646695 - 2³ = 646687 is a prime.

646695 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 712 + ... + 1341.

It is an arithmetic number, because the mean of its divisors is an integer number (53404).

2⁶⁴⁶⁶⁹⁵ is an apocalyptic number.

646695 is a deficient number, since it is larger than the sum of its proper divisors (635001).

646695 is a wasteful number, since it uses less digits than its factorization.

646695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071 (or 2068 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 646695 is about 804.1734887448. The cubic root of 646695 is about 86.4768445711.

It can be divided in two parts, 6466 and 95, that added together give a 8-th power (6561 = 3⁸).

The spelling of 646695 in words is "six hundred forty-six thousand, six hundred ninety-five".