1639706568 has 32 divisors (see below), whose sum is σ = 4100330400. Its totient is φ = 546427008.

The previous prime is 1639706567. The next prime is 1639706581. The reversal of 1639706568 is 8656079361.

It is a self number, because there is not a number n which added to its sum of digits gives 1639706568.

It is not an unprimeable number, because it can be changed into a prime (1639706561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129780 + ... + 141852.

It is an arithmetic number, because the mean of its divisors is an integer number (128135325).

Almost surely, 2^1639706568 is an apocalyptic number.

It is an amenable number.

1639706568 is an abundant number, since it is smaller than the sum of its proper divisors (2460623832).

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

1639706568 is a wasteful number, since it uses less digits than its factorization.

1639706568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17741 (or 17737 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The square root of 1639706568 is about 40493.2904071773. The cubic root of 1639706568 is about 1179.2033711480.

The spelling of 1639706568 in words is "one billion, six hundred thirty-nine million, seven hundred six thousand, five hundred sixty-eight".