19768644 has 96 divisors (see below), whose sum is σ = 59494400. Its totient is φ = 5559840.

The previous prime is 19768621. The next prime is 19768649. The reversal of 19768644 is 44686791.

It is a self number, because there is not a number n which added to its sum of digits gives 19768644.

It is not an unprimeable number, because it can be changed into a prime (19768649) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 59559 + ... + 59889.

Almost surely, 2^19768644 is an apocalyptic number.

19768644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19768644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29747200).

19768644 is an abundant number, since it is smaller than the sum of its proper divisors (39725756).

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

19768644 is a wasteful number, since it uses less digits than its factorization.

19768644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 422 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 19768644 is about 4446.1943277369. The cubic root of 19768644 is about 270.3910383279.

The spelling of 19768644 in words is "nineteen million, seven hundred sixty-eight thousand, six hundred forty-four".