1968720689 has 16 divisors (see below), whose sum is σ = 2190612480. Its totient is φ = 1757004480.

The previous prime is 1968720671. The next prime is 1968720707. The reversal of 1968720689 is 9860278691.

It is an interprime number because it is at equal distance from previous prime (1968720671) and next prime (1968720707).

It is a cyclic number.

It is not a de Polignac number, because 1968720689 - 2²⁸ = 1700285233 is a prime.

It is a super-2 number, since 2×1968720689² = 7751722302593269442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968720289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 671144 + ... + 674070.

It is an arithmetic number, because the mean of its divisors is an integer number (136913280).

Almost surely, 2^1968720689 is an apocalyptic number.

It is an amenable number.

1968720689 is a deficient number, since it is larger than the sum of its proper divisors (221891791).

1968720689 is a wasteful number, since it uses less digits than its factorization.

1968720689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4640.

The product of its (nonzero) digits is 2612736, while the sum is 56.

The square root of 1968720689 is about 44370.2680744663. The cubic root of 1968720689 is about 1253.3182638256.

The spelling of 1968720689 in words is "one billion, nine hundred sixty-eight million, seven hundred twenty thousand, six hundred eighty-nine".