1999996880 has 40 divisors (see below), whose sum is σ = 5314278912. Its totient is φ = 685713024.

The previous prime is 1999996879. The next prime is 1999996897. The reversal of 1999996880 is 886999991.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1999996880.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1785152 + ... + 1786271.

Almost surely, 2^1999996880 is an apocalyptic number.

1999996880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999996880 is an abundant number, since it is smaller than the sum of its proper divisors (3314282032).

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

1999996880 is a wasteful number, since it uses less digits than its factorization.

1999996880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571443 (or 3571437 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 68.

The square root of 1999996880 is about 44721.3246673217. The cubic root of 1999996880 is about 1259.9203947356.

The spelling of 1999996880 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-six thousand, eight hundred eighty".