19910068 has 6 divisors (see below), whose sum is σ = 34842626. Its totient is φ = 9955032.

The previous prime is 19910063. The next prime is 19910089. The reversal of 19910068 is 86001991.

It can be written as a sum of positive squares in only one way, i.e., 11546404 + 8363664 = 3398^2 + 2892^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19910063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2488755 + ... + 2488762.

Almost surely, 2^19910068 is an apocalyptic number.

It is an amenable number.

19910068 is a deficient number, since it is larger than the sum of its proper divisors (14932558).

19910068 is a wasteful number, since it uses less digits than its factorization.

19910068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4977521 (or 4977519 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 19910068 is about 4462.0699232531. The cubic root of 19910068 is about 271.0342953016.

The spelling of 19910068 in words is "nineteen million, nine hundred ten thousand, sixty-eight".