287065989 has 48 divisors (see below), whose sum is σ = 491532288. Its totient is φ = 158042016.

The previous prime is 287065951. The next prime is 287066023. The reversal of 287065989 is 989560782.

It is a happy number.

It is not a de Polignac number, because 287065989 - 2⁸ = 287065733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287065589) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 197664 + ... + 199110.

It is an arithmetic number, because the mean of its divisors is an integer number (10240256).

Almost surely, 2^287065989 is an apocalyptic number.

It is an amenable number.

287065989 is a deficient number, since it is larger than the sum of its proper divisors (204466299).

287065989 is a wasteful number, since it uses less digits than its factorization.

287065989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574 (or 1571 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 287065989 is about 16943.0218379131. The cubic root of 287065989 is about 659.6707793319.

The spelling of 287065989 in words is "two hundred eighty-seven million, sixty-five thousand, nine hundred eighty-nine".