2891143880 has 32 divisors (see below), whose sum is σ = 6552568440. Its totient is φ = 1148014080.

The previous prime is 2891143847. The next prime is 2891143921. The reversal of 2891143880 is 883411982.

It can be written as a sum of positive squares in 4 ways, for example, as 2214831844 + 676312036 = 47062^2 + 26006^2 .

It is a super-2 number, since 2×2891143880² = 16717425869722908800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258311 + ... + 269270.

Almost surely, 2^2891143880 is an apocalyptic number.

2891143880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2891143880 is an abundant number, since it is smaller than the sum of its proper divisors (3661424560).

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

2891143880 is a wasteful number, since it uses less digits than its factorization.

2891143880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527729 (or 527725 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 2891143880 is about 53769.3581884701. The cubic root of 2891143880 is about 1424.5900337022.

The spelling of 2891143880 in words is "two billion, eight hundred ninety-one million, one hundred forty-three thousand, eight hundred eighty".