645364 has 6 divisors (see below), whose sum is σ = 1129394. Its totient is φ = 322680.

The previous prime is 645353. The next prime is 645367. The reversal of 645364 is 463546.

It can be written as a sum of positive squares in only one way, i.e., 435600 + 209764 = 660^2 + 458^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645367) 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 as a sum of consecutive naturals, namely, 80667 + ... + 80674.

2⁶⁴⁵³⁶⁴ is an apocalyptic number.

It is an amenable number.

645364 is a deficient number, since it is larger than the sum of its proper divisors (484030).

645364 is a wasteful number, since it uses less digits than its factorization.

645364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161345 (or 161343 counting only the distinct ones).

The product of its digits is 8640, while the sum is 28.

The square root of 645364 is about 803.3455047487. The cubic root of 645364 is about 86.4174761745.

The spelling of 645364 in words is "six hundred forty-five thousand, three hundred sixty-four".