287287961 has 4 divisors (see below), whose sum is σ = 302408400. Its totient is φ = 272167524.

The previous prime is 287287951. The next prime is 287287969. The reversal of 287287961 is 169782782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 287287961 - 2²⁶ = 220179097 is a prime.

It is a super-3 number, since 3×287287961³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287287969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7560191 + ... + 7560228.

It is an arithmetic number, because the mean of its divisors is an integer number (75602100).

Almost surely, 2^287287961 is an apocalyptic number.

It is an amenable number.

287287961 is a deficient number, since it is larger than the sum of its proper divisors (15120439).

287287961 is a wasteful number, since it uses less digits than its factorization.

287287961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15120438.

The product of its digits is 677376, while the sum is 50.

The square root of 287287961 is about 16949.5711155179. The cubic root of 287287961 is about 659.8407643091.

The spelling of 287287961 in words is "two hundred eighty-seven million, two hundred eighty-seven thousand, nine hundred sixty-one".