287421437689 has 9 divisors (see below), whose sum is σ = 288638717133. Its totient is φ = 286209277152.

The previous prime is 287421437687. The next prime is 287421437701. The reversal of 287421437689 is 986734124782.

The square root of 287421437689 is 536117.

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

It can be written as a sum of positive squares in 4 ways, for example, as 22702955625 + 264718482064 = 150675^2 + 514508^2 .

It is not a de Polignac number, because 287421437689 - 2¹ = 287421437687 is a prime.

It is a super-2 number, since 2×287421437689² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287421437687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 144214477 + ... + 144216469.

Almost surely, 2^287421437689 is an apocalyptic number.

287421437689 is the 536117-th square number.

287421437689 is the 268059-th centered octagonal number.

It is an amenable number.

287421437689 is a deficient number, since it is larger than the sum of its proper divisors (1217279444).

287421437689 is an frugal number, since it uses more digits than its factorization.

287421437689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4524 (or 2262 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 61.

The spelling of 287421437689 in words is "two hundred eighty-seven billion, four hundred twenty-one million, four hundred thirty-seven thousand, six hundred eighty-nine".