287681265 has 24 divisors (see below), whose sum is σ = 504965760. Its totient is φ = 151485984.

The previous prime is 287681249. The next prime is 287681269. The reversal of 287681265 is 562186782.

It is not a de Polignac number, because 287681265 - 2⁴ = 287681249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 287681265.

It is not an unprimeable number, because it can be changed into a prime (287681269) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36907 + ... + 44016.

It is an arithmetic number, because the mean of its divisors is an integer number (21040240).

Almost surely, 2^287681265 is an apocalyptic number.

It is an amenable number.

287681265 is a deficient number, since it is larger than the sum of its proper divisors (217284495).

287681265 is a wasteful number, since it uses less digits than its factorization.

287681265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81013 (or 81010 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 287681265 is about 16961.1693287933. The cubic root of 287681265 is about 660.1417395307.

The spelling of 287681265 in words is "two hundred eighty-seven million, six hundred eighty-one thousand, two hundred sixty-five".