1999772028144 has 240 divisors, whose sum is σ = 6608838435840. Its totient is φ = 574096740480.

The previous prime is 1999772028109. The next prime is 1999772028157. The reversal of 1999772028144 is 4418202779991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1132609 + ... + 2298335.

It is an arithmetic number, because the mean of its divisors is an integer number (27536826816).

Almost surely, 2^{1999772028144} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999772028144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3304419217920).

1999772028144 is an abundant number, since it is smaller than the sum of its proper divisors (4609066407696).

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

1999772028144 is a wasteful number, since it uses less digits than its factorization.

1999772028144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165793 (or 1165762 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 63.

The spelling of 1999772028144 in words is "one trillion, nine hundred ninety-nine billion, seven hundred seventy-two million, twenty-eight thousand, one hundred forty-four".