19776794128 has 40 divisors (see below), whose sum is σ = 47160051008. Its totient is φ = 7823786112.

The previous prime is 19776794111. The next prime is 19776794129. The reversal of 19776794128 is 82149767791.

It is a super-2 number, since 2×19776794128² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19776794129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6790026 + ... + 6792937.

Almost surely, 2^19776794128 is an apocalyptic number.

It is an amenable number.

19776794128 is an abundant number, since it is smaller than the sum of its proper divisors (27383256880).

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

19776794128 is a wasteful number, since it uses less digits than its factorization.

19776794128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13582991 (or 13582985 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 61.

It can be divided in two parts, 197767941 and 28, that added together give a square (197767969 = 14063²).

The spelling of 19776794128 in words is "nineteen billion, seven hundred seventy-six million, seven hundred ninety-four thousand, one hundred twenty-eight".