645938334 has 16 divisors (see below), whose sum is σ = 1435418640. Its totient is φ = 215312760.

The previous prime is 645938327. The next prime is 645938339. The reversal of 645938334 is 433839546.

It is a self number, because there is not a number n which added to its sum of digits gives 645938334.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645938339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5980857 + ... + 5980964.

It is an arithmetic number, because the mean of its divisors is an integer number (89713665).

Almost surely, 2^645938334 is an apocalyptic number.

645938334 is an abundant number, since it is smaller than the sum of its proper divisors (789480306).

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

645938334 is a wasteful number, since it uses less digits than its factorization.

645938334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11961832 (or 11961826 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 645938334 is about 25415.3169171663. The cubic root of 645938334 is about 864.4310397460.

It can be divided in two parts, 64593 and 8334, that added together give a palindrome (72927).

The spelling of 645938334 in words is "six hundred forty-five million, nine hundred thirty-eight thousand, three hundred thirty-four".