19428946816 has 32 divisors (see below), whose sum is σ = 38785708080. Its totient is φ = 9694494720.

The previous prime is 19428946813. The next prime is 19428946819. The reversal of 19428946816 is 61864982491.

It is an interprime number because it is at equal distance from previous prime (19428946813) and next prime (19428946819).

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19428946813) 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, 93505 + ... + 218176.

Almost surely, 2^19428946816 is an apocalyptic number.

19428946816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19428946816 is a deficient number, since it is larger than the sum of its proper divisors (19356761264).

19428946816 is an equidigital number, since it uses as much as digits as its factorization.

19428946816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312182 (or 312170 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 58.

The spelling of 19428946816 in words is "nineteen billion, four hundred twenty-eight million, nine hundred forty-six thousand, eight hundred sixteen".