645662 has 8 divisors (see below), whose sum is σ = 972000. Its totient is φ = 321664.

The previous prime is 645661. The next prime is 645683. The reversal of 645662 is 266546.

It is a sphenic number, since it is the product of 3 distinct primes.

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 645662.

It is not an unprimeable number, because it can be changed into a prime (645661) 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, 539 + ... + 1257.

It is an arithmetic number, because the mean of its divisors is an integer number (121500).

2⁶⁴⁵⁶⁶² is an apocalyptic number.

645662 is a deficient number, since it is larger than the sum of its proper divisors (326338).

645662 is a wasteful number, since it uses less digits than its factorization.

645662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170.

The product of its digits is 8640, while the sum is 29.

The square root of 645662 is about 803.5309577110. The cubic root of 645662 is about 86.4307753592.

The spelling of 645662 in words is "six hundred forty-five thousand, six hundred sixty-two".