19319917428 has 36 divisors (see below), whose sum is σ = 55813095520. Its totient is φ = 5519976336.

The previous prime is 19319917417. The next prime is 19319917429. The reversal of 19319917428 is 82471991391.

19319917428 is a `hidden beast` number, since 19 + 3 + 199 + 17 + 428 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19319917429) 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, 38332918 + ... + 38333421.

Almost surely, 2^19319917428 is an apocalyptic number.

19319917428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19319917428 is an abundant number, since it is smaller than the sum of its proper divisors (36493178092).

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

19319917428 is a wasteful number, since it uses less digits than its factorization.

19319917428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76666356 (or 76666351 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The spelling of 19319917428 in words is "nineteen billion, three hundred nineteen million, nine hundred seventeen thousand, four hundred twenty-eight".