19776956928 has 80 divisors (see below), whose sum is σ = 54503966880. Its totient is φ = 6364983296.

The previous prime is 19776956921. The next prime is 19776956977. The reversal of 19776956928 is 82965967791.

It is a super-2 number, since 2×19776956928² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19776956921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177450 + ... + 266537.

It is an arithmetic number, because the mean of its divisors is an integer number (681299586).

Almost surely, 2^19776956928 is an apocalyptic number.

It is an amenable number.

19776956928 is an abundant number, since it is smaller than the sum of its proper divisors (34727009952).

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

19776956928 is an equidigital number, since it uses as much as digits as its factorization.

19776956928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444037 (or 444021 counting only the distinct ones).

The product of its digits is 102876480, while the sum is 69.

The spelling of 19776956928 in words is "nineteen billion, seven hundred seventy-six million, nine hundred fifty-six thousand, nine hundred twenty-eight".