19643338428 has 24 divisors (see below), whose sum is σ = 52382236032. Its totient is φ = 5612382384.

The previous prime is 19643338409. The next prime is 19643338433. The reversal of 19643338428 is 82483334691.

It is a super-2 number, since 2×19643338428² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116924550 + ... + 116924717.

It is an arithmetic number, because the mean of its divisors is an integer number (2182593168).

Almost surely, 2^19643338428 is an apocalyptic number.

It is an amenable number.

19643338428 is an abundant number, since it is smaller than the sum of its proper divisors (32738897604).

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

19643338428 is a wasteful number, since it uses less digits than its factorization.

19643338428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233849281 (or 233849279 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 51.

The spelling of 19643338428 in words is "nineteen billion, six hundred forty-three million, three hundred thirty-eight thousand, four hundred twenty-eight".