645064 has 16 divisors (see below), whose sum is σ = 1382400. Its totient is φ = 276432.

The previous prime is 645049. The next prime is 645067. The reversal of 645064 is 460546.

It is a happy number.

It is a super-2 number, since 2×645064² = 832215128192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645067) by changing a digit.

645064 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 5704 + ... + 5815.

It is an arithmetic number, because the mean of its divisors is an integer number (86400).

2⁶⁴⁵⁰⁶⁴ is an apocalyptic number.

It is an amenable number.

645064 is an abundant number, since it is smaller than the sum of its proper divisors (737336).

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

645064 is a wasteful number, since it uses less digits than its factorization.

645064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11532 (or 11528 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 645064 is about 803.1587638817. The cubic root of 645064 is about 86.4040835976.

The spelling of 645064 in words is "six hundred forty-five thousand, sixty-four".