645592 has 32 divisors (see below), whose sum is σ = 1321920. Its totient is φ = 294400.

The previous prime is 645583. The next prime is 645599. The reversal of 645592 is 295546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645599) 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, 6342 + ... + 6442.

It is an arithmetic number, because the mean of its divisors is an integer number (41310).

2⁶⁴⁵⁵⁹² is an apocalyptic number.

It is an amenable number.

645592 is an abundant number, since it is smaller than the sum of its proper divisors (676328).

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

645592 is a wasteful number, since it uses less digits than its factorization.

645592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 167 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 645592 is about 803.4873987811. The cubic root of 645592 is about 86.4276517574.

The spelling of 645592 in words is "six hundred forty-five thousand, five hundred ninety-two".