19008556428 has 12 divisors (see below), whose sum is σ = 44353298360. Its totient is φ = 6336185472.

The previous prime is 19008556423. The next prime is 19008556459. The reversal of 19008556428 is 82465580091.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×19008556428² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19008556421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792023173 + ... + 792023196.

Almost surely, 2^19008556428 is an apocalyptic number.

It is an amenable number.

19008556428 is an abundant number, since it is smaller than the sum of its proper divisors (25344741932).

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

19008556428 is a wasteful number, since it uses less digits than its factorization.

19008556428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584046376 (or 1584046374 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 19008556428 in words is "nineteen billion, eight million, five hundred fifty-six thousand, four hundred twenty-eight".