1640323306 has 16 divisors (see below), whose sum is σ = 2502339840. Its totient is φ = 806226480.

The previous prime is 1640323301. The next prime is 1640323309. The reversal of 1640323306 is 6033230461.

It is not an unprimeable number, because it can be changed into a prime (1640323301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276075 + ... + 281953.

It is an arithmetic number, because the mean of its divisors is an integer number (156396240).

Almost surely, 2^1640323306 is an apocalyptic number.

1640323306 is a deficient number, since it is larger than the sum of its proper divisors (862016534).

1640323306 is a wasteful number, since it uses less digits than its factorization.

1640323306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8229.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 1640323306 is about 40500.9050022342. The cubic root of 1640323306 is about 1179.3511960457.

Adding to 1640323306 its reverse (6033230461), we get a palindrome (7673553767).

The spelling of 1640323306 in words is "one billion, six hundred forty million, three hundred twenty-three thousand, three hundred six".