19827904428 has 36 divisors (see below), whose sum is σ = 50754980640. Its totient is φ = 6525638496.

The previous prime is 19827904399. The next prime is 19827904483. The reversal of 19827904428 is 82440972891.

19827904428 is a `hidden beast` number, since 1 + 98 + 27 + 90 + 442 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3483075 + ... + 3488762.

Almost surely, 2^19827904428 is an apocalyptic number.

19827904428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19827904428 is an abundant number, since it is smaller than the sum of its proper divisors (30927076212).

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

19827904428 is a wasteful number, since it uses less digits than its factorization.

19827904428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6971926 (or 6971921 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 19827904428 in words is "nineteen billion, eight hundred twenty-seven million, nine hundred four thousand, four hundred twenty-eight".