281989937872 has 10 divisors (see below), whose sum is σ = 546355504658. Its totient is φ = 140994968928.

The previous prime is 281989937843. The next prime is 281989937899. The reversal of 281989937872 is 278739989182.

It can be written as a sum of positive squares in only one way, i.e., 197950247056 + 84039690816 = 444916^2 + 289896^2 .

It is a super-2 number, since 2×281989937872² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 281989937795 and 281989937804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8812185543 + ... + 8812185574.

Almost surely, 2^281989937872 is an apocalyptic number.

It is an amenable number.

281989937872 is a deficient number, since it is larger than the sum of its proper divisors (264365566786).

281989937872 is a wasteful number, since it uses less digits than its factorization.

281989937872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17624371125 (or 17624371119 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 73.

The spelling of 281989937872 in words is "two hundred eighty-one billion, nine hundred eighty-nine million, nine hundred thirty-seven thousand, eight hundred seventy-two".