287728988 has 12 divisors (see below), whose sum is σ = 525418320. Its totient is φ = 137609472.

The previous prime is 287728967. The next prime is 287728999. The reversal of 287728988 is 889827782.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1563653 + ... + 1563836.

It is an arithmetic number, because the mean of its divisors is an integer number (43784860).

Almost surely, 2^287728988 is an apocalyptic number.

It is an amenable number.

287728988 is a deficient number, since it is larger than the sum of its proper divisors (237689332).

287728988 is a wasteful number, since it uses less digits than its factorization.

287728988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3127516 (or 3127514 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 59.

The square root of 287728988 is about 16962.5761015242. The cubic root of 287728988 is about 660.1782408097.

The spelling of 287728988 in words is "two hundred eighty-seven million, seven hundred twenty-eight thousand, nine hundred eighty-eight".