19995779628 has 72 divisors (see below), whose sum is σ = 55159104000. Its totient is φ = 6057214560.

The previous prime is 19995779599. The next prime is 19995779651. The reversal of 19995779628 is 82697759991.

It is a super-3 number, since 3×19995779628³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1421373 + ... + 1435371.

Almost surely, 2^19995779628 is an apocalyptic number.

19995779628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19995779628 is an abundant number, since it is smaller than the sum of its proper divisors (35163324372).

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

19995779628 is a wasteful number, since it uses less digits than its factorization.

19995779628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17627 (or 17622 counting only the distinct ones).

The product of its digits is 154314720, while the sum is 72.

The spelling of 19995779628 in words is "nineteen billion, nine hundred ninety-five million, seven hundred seventy-nine thousand, six hundred twenty-eight".