19728755 has 8 divisors (see below), whose sum is σ = 25067232. Its totient is φ = 14854528.

The previous prime is 19728743. The next prime is 19728757. The reversal of 19728755 is 55782791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19728755 - 2⁴ = 19728739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19728757) 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, 115967 + ... + 116136.

It is an arithmetic number, because the mean of its divisors is an integer number (3133404).

Almost surely, 2^19728755 is an apocalyptic number.

19728755 is a deficient number, since it is larger than the sum of its proper divisors (5338477).

19728755 is a wasteful number, since it uses less digits than its factorization.

19728755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232125.

The product of its digits is 176400, while the sum is 44.

The square root of 19728755 is about 4441.7063162708. The cubic root of 19728755 is about 270.2090516313.

The spelling of 19728755 in words is "nineteen million, seven hundred twenty-eight thousand, seven hundred fifty-five".