1640305344 has 28 divisors (see below), whose sum is σ = 4339975064. Its totient is φ = 546768384.

The previous prime is 1640305339. The next prime is 1640305351. The reversal of 1640305344 is 4435030461.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4271437 + ... + 4271820.

Almost surely, 2^1640305344 is an apocalyptic number.

It is an amenable number.

1640305344 is an abundant number, since it is smaller than the sum of its proper divisors (2699669720).

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

1640305344 is an equidigital number, since it uses as much as digits as its factorization.

1640305344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8543272 (or 8543262 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 1640305344 is about 40500.6832534959. The cubic root of 1640305344 is about 1179.3468912880.

The spelling of 1640305344 in words is "one billion, six hundred forty million, three hundred five thousand, three hundred forty-four".