19728816 has 40 divisors (see below), whose sum is σ = 52727280. Its totient is φ = 6349056.

The previous prime is 19728811. The next prime is 19728829. The reversal of 19728816 is 61882791.

It is not an unprimeable number, because it can be changed into a prime (19728811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5695 + ... + 8478.

It is an arithmetic number, because the mean of its divisors is an integer number (1318182).

Almost surely, 2^19728816 is an apocalyptic number.

19728816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19728816 is an abundant number, since it is smaller than the sum of its proper divisors (32998464).

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

19728816 is a wasteful number, since it uses less digits than its factorization.

19728816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14213 (or 14207 counting only the distinct ones).

The product of its digits is 48384, while the sum is 42.

The square root of 19728816 is about 4441.7131829959. The cubic root of 19728816 is about 270.2093301205.

The spelling of 19728816 in words is "nineteen million, seven hundred twenty-eight thousand, eight hundred sixteen".