19780879572 has 36 divisors (see below), whose sum is σ = 50260761460. Its totient is φ = 6559460352.

The previous prime is 19780879549. The next prime is 19780879619. The reversal of 19780879572 is 27597808791.

It can be written as a sum of positive squares in 2 ways, for example, as 6765720516 + 13015159056 = 82254^2 + 114084^2 .

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

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1416547 + ... + 1430442.

Almost surely, 2^19780879572 is an apocalyptic number.

19780879572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19780879572 is an abundant number, since it is smaller than the sum of its proper divisors (30479881888).

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

19780879572 is a wasteful number, since it uses less digits than its factorization.

19780879572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2847192 (or 2847187 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 63.

The spelling of 19780879572 in words is "nineteen billion, seven hundred eighty million, eight hundred seventy-nine thousand, five hundred seventy-two".