645524 has 24 divisors (see below), whose sum is σ = 1306368. Its totient is φ = 275840.

The previous prime is 645521. The next prime is 645527. The reversal of 645524 is 425546.

645524 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645521) and next prime (645527).

It is a junction number, because it is equal to n+sod(n) for n = 645493 and 645502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645521) 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, 317 + ... + 1179.

It is an arithmetic number, because the mean of its divisors is an integer number (54432).

2⁶⁴⁵⁵²⁴ is an apocalyptic number.

It is an amenable number.

645524 is an abundant number, since it is smaller than the sum of its proper divisors (660844).

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

645524 is a wasteful number, since it uses less digits than its factorization.

645524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895 (or 893 counting only the distinct ones).

The product of its digits is 4800, while the sum is 26.

The square root of 645524 is about 803.4450821307. The cubic root of 645524 is about 86.4246171852.

The spelling of 645524 in words is "six hundred forty-five thousand, five hundred twenty-four".