287131328 has 28 divisors (see below), whose sum is σ = 621575592. Its totient is φ = 130513920.

The previous prime is 287131321. The next prime is 287131337. The reversal of 287131328 is 823131782.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (287131321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203225 + ... + 204632.

Almost surely, 2^287131328 is an apocalyptic number.

It is an amenable number.

287131328 is an abundant number, since it is smaller than the sum of its proper divisors (334444264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

287131328 is a wasteful number, since it uses less digits than its factorization.

287131328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407880 (or 407870 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 287131328 is about 16944.9499261579. The cubic root of 287131328 is about 659.7208246884.

The spelling of 287131328 in words is "two hundred eighty-seven million, one hundred thirty-one thousand, three hundred twenty-eight".