287984599471881 has 27 divisors (see below), whose sum is σ = 450438485635047. Its totient is φ = 177220884700080.

The previous prime is 287984599471853. The next prime is 287984599471937. The reversal of 287984599471881 is 188174995489782.

The square root of 287984599471881 is 16970109.

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

287984599471881 is a `hidden beast` number, since 2 + 8 + 7 + 9 + 8 + 4 + 59 + 9 + 471 + 8 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 42601272111225 + 245383327360656 = 6526965^2 + 15664716^2 .

It is not a de Polignac number, because 287984599471881 - 2²⁵ = 287984565917449 is a prime.

It is a super-2 number, since 2×287984599471881² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 287984599471791 and 287984599471800.

It is not an unprimeable number, because it can be changed into a prime (287984599471801) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 661616686 + ... + 662051816.

Almost surely, 2^{287984599471881} is an apocalyptic number.

287984599471881 is the 16970109-th square number.

287984599471881 is the 8485055-th centered octagonal number.

It is an amenable number.

287984599471881 is a deficient number, since it is larger than the sum of its proper divisors (162453886163166).

287984599471881 is an frugal number, since it uses more digits than its factorization.

287984599471881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870294 (or 435147 counting only the distinct ones).

The product of its digits is 23410114560, while the sum is 90.

The spelling of 287984599471881 in words is "two hundred eighty-seven trillion, nine hundred eighty-four billion, five hundred ninety-nine million, four hundred seventy-one thousand, eight hundred eighty-one".