2991780871992 has 144 divisors (see below), whose sum is σ = 8994501374040. Its totient is φ = 897623760000.

The previous prime is 2991780871967. The next prime is 2991780872029.

2991780871992 is a `hidden beast` number, since 299 + 1 + 78 + 0 + 87 + 199 + 2 = 666.

2991780871992 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 2991780871992.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 820134 + ... + 2579957.

Almost surely, 2^{2991780871992} is an apocalyptic number.

2991780871992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2991780871992 is an abundant number, since it is smaller than the sum of its proper divisors (6002720502048).

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

2991780871992 is a wasteful number, since it uses less digits than its factorization.

2991780871992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400226 (or 3400208 counting only the distinct ones).

The product of its (nonzero) digits is 82301184, while the sum is 72.

The spelling of 2991780871992 in words is "two trillion, nine hundred ninety-one billion, seven hundred eighty million, eight hundred seventy-one thousand, nine hundred ninety-two".