19725728 has 24 divisors (see below), whose sum is σ = 42366240. Its totient is φ = 8966080.

The previous prime is 19725701. The next prime is 19725731. The reversal of 19725728 is 82752791.

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 3 ways as a sum of consecutive naturals, for example, 27668 + ... + 28371.

It is an arithmetic number, because the mean of its divisors is an integer number (1765260).

Almost surely, 2^19725728 is an apocalyptic number.

It is an amenable number.

19725728 is an abundant number, since it is smaller than the sum of its proper divisors (22640512).

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

19725728 is a wasteful number, since it uses less digits than its factorization.

19725728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56060 (or 56052 counting only the distinct ones).

The product of its digits is 70560, while the sum is 41.

The square root of 19725728 is about 4441.3655557722. The cubic root of 19725728 is about 270.1952314547.

The spelling of 19725728 in words is "nineteen million, seven hundred twenty-five thousand, seven hundred twenty-eight".