19728364 has 24 divisors (see below), whose sum is σ = 36747648. Its totient is φ = 9235200.

The previous prime is 19728337. The next prime is 19728367. The reversal of 19728364 is 46382791.

It is a super-2 number, since 2×19728364² = 778416692232992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19728367) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14514 + ... + 15814.

It is an arithmetic number, because the mean of its divisors is an integer number (1531152).

Almost surely, 2^19728364 is an apocalyptic number.

It is an amenable number.

19728364 is a deficient number, since it is larger than the sum of its proper divisors (17019284).

19728364 is a wasteful number, since it uses less digits than its factorization.

19728364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545 (or 1543 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 19728364 is about 4441.6623014363. The cubic root of 19728364 is about 270.2072665476.

It can be divided in two parts, 197 and 28364, that added together give a 4-th power (28561 = 13⁴).

The spelling of 19728364 in words is "nineteen million, seven hundred twenty-eight thousand, three hundred sixty-four".