645442052 has 12 divisors (see below), whose sum is σ = 1137650640. Its totient is φ = 320399016.

The previous prime is 645442051. The next prime is 645442079. The reversal of 645442052 is 250244546.

It is not an unprimeable number, because it can be changed into a prime (645442051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 579878 + ... + 580989.

It is an arithmetic number, because the mean of its divisors is an integer number (94804220).

Almost surely, 2^645442052 is an apocalyptic number.

It is an amenable number.

645442052 is a deficient number, since it is larger than the sum of its proper divisors (492208588).

645442052 is a wasteful number, since it uses less digits than its factorization.

645442052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161010 (or 1161008 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

The square root of 645442052 is about 25405.5515980268. The cubic root of 645442052 is about 864.2095988547.

Adding to 645442052 its reverse (250244546), we get a palindrome (895686598).

The spelling of 645442052 in words is "six hundred forty-five million, four hundred forty-two thousand, fifty-two".