645336 has 24 divisors (see below), whose sum is σ = 1747980. Its totient is φ = 215088.

The previous prime is 645329. The next prime is 645347. The reversal of 645336 is 633546.

645336 = T₂₀₅ + T₂₀₆ + ... + T₂₃₁.

645336 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

645336 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4410 + ... + 4553.

2⁶⁴⁵³³⁶ is an apocalyptic number.

It is an amenable number.

645336 is an abundant number, since it is smaller than the sum of its proper divisors (1102644).

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

645336 is a wasteful number, since it uses less digits than its factorization.

645336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8975 (or 8968 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 645336 is about 803.3280774379. The cubic root of 645336 is about 86.4162263763.

The spelling of 645336 in words is "six hundred forty-five thousand, three hundred thirty-six".