1643401768 has 32 divisors (see below), whose sum is σ = 3172118400. Its totient is φ = 797608512.

The previous prime is 1643401759. The next prime is 1643401801. The reversal of 1643401768 is 8671043461.

It is a self number, because there is not a number n which added to its sum of digits gives 1643401768.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123621 + ... + 136267.

It is an arithmetic number, because the mean of its divisors is an integer number (99128700).

Almost surely, 2^1643401768 is an apocalyptic number.

It is an amenable number.

1643401768 is a deficient number, since it is larger than the sum of its proper divisors (1528716632).

1643401768 is a wasteful number, since it uses less digits than its factorization.

1643401768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13129 (or 13125 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 1643401768 is about 40538.8920420872. The cubic root of 1643401768 is about 1180.0885139003.

The spelling of 1643401768 in words is "one billion, six hundred forty-three million, four hundred one thousand, seven hundred sixty-eight".