645739232 has 12 divisors (see below), whose sum is σ = 1271299176. Its totient is φ = 322869600.

The previous prime is 645739231. The next prime is 645739261. The reversal of 645739232 is 232937546.

645739232 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645739232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645739231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10089644 + ... + 10089707.

It is an arithmetic number, because the mean of its divisors is an integer number (105941598).

Almost surely, 2^645739232 is an apocalyptic number.

It is an amenable number.

645739232 is a deficient number, since it is larger than the sum of its proper divisors (625559944).

645739232 is a wasteful number, since it uses less digits than its factorization.

645739232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20179361 (or 20179353 counting only the distinct ones).

The product of its digits is 272160, while the sum is 41.

The square root of 645739232 is about 25411.3996466153. The cubic root of 645739232 is about 864.3422141175.

The spelling of 645739232 in words is "six hundred forty-five million, seven hundred thirty-nine thousand, two hundred thirty-two".