19408728609 has 12 divisors (see below), whose sum is σ = 28296839376. Its totient is φ = 12818225112.

The previous prime is 19408728607. The next prime is 19408728613. The reversal of 19408728609 is 90682780491.

19408728609 is a `hidden beast` number, since 1 + 9 + 4 + 0 + 8 + 7 + 28 + 609 = 666.

It is not a de Polignac number, because 19408728609 - 2¹ = 19408728607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19408728601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10076259 + ... + 10078184.

It is an arithmetic number, because the mean of its divisors is an integer number (2358069948).

Almost surely, 2^19408728609 is an apocalyptic number.

It is an amenable number.

19408728609 is a deficient number, since it is larger than the sum of its proper divisors (8888110767).

19408728609 is a wasteful number, since it uses less digits than its factorization.

19408728609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20154556 (or 20154553 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 19408728609 in words is "nineteen billion, four hundred eight million, seven hundred twenty-eight thousand, six hundred nine".