19708728 has 64 divisors (see below), whose sum is σ = 53508000. Its totient is φ = 6013440.

The previous prime is 19708709. The next prime is 19708747. The reversal of 19708728 is 82780791.

It is an interprime number because it is at equal distance from previous prime (19708709) and next prime (19708747).

It is a self number, because there is not a number n which added to its sum of digits gives 19708728.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56298 + ... + 56646.

Almost surely, 2^19708728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19708728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26754000).

19708728 is an abundant number, since it is smaller than the sum of its proper divisors (33799272).

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

19708728 is a wasteful number, since it uses less digits than its factorization.

19708728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 19708728 is about 4439.4513174490. The cubic root of 19708728 is about 270.1175893840.

The spelling of 19708728 in words is "nineteen million, seven hundred eight thousand, seven hundred twenty-eight".