287983562881 has 27 divisors (see below), whose sum is σ = 346296408003. Its totient is φ = 238783779360.

The previous prime is 287983562873. The next prime is 287983562917. The reversal of 287983562881 is 188265389782.

The square root of 287983562881 is 536641.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 214642257025 + 73341305856 = 463295^2 + 270816^2 .

It is not a de Polignac number, because 287983562881 - 2³ = 287983562873 is a prime.

It is a super-2 number, since 2×287983562881² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (287983562821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 116449861 + ... + 116452333.

It is an arithmetic number, because the mean of its divisors is an integer number (12825792889).

Almost surely, 2^287983562881 is an apocalyptic number.

287983562881 is the 536641-st square number.

287983562881 is the 268321-st centered octagonal number.

It is an amenable number.

287983562881 is a deficient number, since it is larger than the sum of its proper divisors (58312845122).

287983562881 is an frugal number, since it uses more digits than its factorization.

287983562881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5022 (or 2511 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 67.

The spelling of 287983562881 in words is "two hundred eighty-seven billion, nine hundred eighty-three million, five hundred sixty-two thousand, eight hundred eighty-one".