645838332 has 12 divisors (see below), whose sum is σ = 1506956136. Its totient is φ = 215279440.

The previous prime is 645838309. The next prime is 645838343. The reversal of 645838332 is 233838546.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26909919 + ... + 26909942.

It is an arithmetic number, because the mean of its divisors is an integer number (125579678).

Almost surely, 2^645838332 is an apocalyptic number.

It is an amenable number.

645838332 is an abundant number, since it is smaller than the sum of its proper divisors (861117804).

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

645838332 is a wasteful number, since it uses less digits than its factorization.

645838332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53819868 (or 53819866 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 645838332 is about 25413.3494840802. The cubic root of 645838332 is about 864.3864280084.

The spelling of 645838332 in words is "six hundred forty-five million, eight hundred thirty-eight thousand, three hundred thirty-two".