640069322 has 8 divisors (see below), whose sum is σ = 960348900. Its totient is φ = 319953024.

The previous prime is 640069303. The next prime is 640069333. The reversal of 640069322 is 223960046.

640069322 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 558329641 + 81739681 = 23629^2 + 9041^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 30497 + ... + 47012.

Almost surely, 2^640069322 is an apocalyptic number.

640069322 is a deficient number, since it is larger than the sum of its proper divisors (320279578).

640069322 is a wasteful number, since it uses less digits than its factorization.

640069322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81640.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 640069322 is about 25299.5913405731. The cubic root of 640069322 is about 861.8049894148.

The spelling of 640069322 in words is "six hundred forty million, sixty-nine thousand, three hundred twenty-two".