645366 has 16 divisors (see below), whose sum is σ = 1335600. Its totient is φ = 207648.

The previous prime is 645353. The next prime is 645367. The reversal of 645366 is 663546.

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 645366.

It is not an unprimeable number, because it can be changed into a prime (645367) 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, 1681 + ... + 2028.

It is an arithmetic number, because the mean of its divisors is an integer number (83475).

2⁶⁴⁵³⁶⁶ is an apocalyptic number.

645366 is an abundant number, since it is smaller than the sum of its proper divisors (690234).

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

645366 is a wasteful number, since it uses less digits than its factorization.

645366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3743.

The product of its digits is 12960, while the sum is 30.

The square root of 645366 is about 803.3467495422. The cubic root of 645366 is about 86.4175654444.

The spelling of 645366 in words is "six hundred forty-five thousand, three hundred sixty-six".