645526 has 16 divisors (see below), whose sum is σ = 1130400. Its totient is φ = 276360.

The previous prime is 645521. The next prime is 645527. The reversal of 645526 is 625546.

It is a junction number, because it is equal to n+sod(n) for n = 645494 and 645503.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (70650).

2⁶⁴⁵⁵²⁶ is an apocalyptic number.

645526 is a deficient number, since it is larger than the sum of its proper divisors (484874).

645526 is an equidigital number, since it uses as much as digits as its factorization.

645526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964 (or 950 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 645526 is about 803.4463267699. The cubic root of 645526 is about 86.4247064404.

The spelling of 645526 in words is "six hundred forty-five thousand, five hundred twenty-six".