19728512438 has 8 divisors (see below), whose sum is σ = 29599333632. Its totient is φ = 9862067896.

The previous prime is 19728512429. The next prime is 19728512477. The reversal of 19728512438 is 83421582791.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1082870 + ... + 1100937.

It is an arithmetic number, because the mean of its divisors is an integer number (3699916704).

Almost surely, 2^19728512438 is an apocalyptic number.

19728512438 is a deficient number, since it is larger than the sum of its proper divisors (9870821194).

19728512438 is a wasteful number, since it uses less digits than its factorization.

19728512438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188326.

The product of its digits is 967680, while the sum is 50.

The spelling of 19728512438 in words is "nineteen billion, seven hundred twenty-eight million, five hundred twelve thousand, four hundred thirty-eight".