645442322 has 16 divisors (see below), whose sum is σ = 1108123200. Its totient is φ = 276205488.

The previous prime is 645442313. The next prime is 645442333. The reversal of 645442322 is 223244546.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24572 + ... + 43527.

It is an arithmetic number, because the mean of its divisors is an integer number (69257700).

Almost surely, 2^645442322 is an apocalyptic number.

645442322 is a deficient number, since it is larger than the sum of its proper divisors (462680878).

645442322 is a wasteful number, since it uses less digits than its factorization.

645442322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68785.

The product of its digits is 46080, while the sum is 32.

The square root of 645442322 is about 25405.5569118254. The cubic root of 645442322 is about 864.2097193595.

Adding to 645442322 its reverse (223244546), we get a palindrome (868686868).

It can be divided in two parts, 64544 and 2322, that added together give a palindrome (66866).

The spelling of 645442322 in words is "six hundred forty-five million, four hundred forty-two thousand, three hundred twenty-two".