645572 has 12 divisors (see below), whose sum is σ = 1136016. Its totient is φ = 321000.

The previous prime is 645571. The next prime is 645577. The reversal of 645572 is 275546.

645572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (645571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683 + ... + 1325.

It is an arithmetic number, because the mean of its divisors is an integer number (94668).

2⁶⁴⁵⁵⁷² is an apocalyptic number.

It is an amenable number.

645572 is a deficient number, since it is larger than the sum of its proper divisors (490444).

645572 is a wasteful number, since it uses less digits than its factorization.

645572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 896 counting only the distinct ones).

The product of its digits is 8400, while the sum is 29.

The square root of 645572 is about 803.4749529388. The cubic root of 645572 is about 86.4267592583.

The spelling of 645572 in words is "six hundred forty-five thousand, five hundred seventy-two".