287322728 has 48 divisors (see below), whose sum is σ = 676767840. Its totient is φ = 111941280.

The previous prime is 287322701. The next prime is 287322751. The reversal of 287322728 is 827223782.

287322728 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14426 + ... + 27977.

It is an arithmetic number, because the mean of its divisors is an integer number (14099330).

Almost surely, 2^287322728 is an apocalyptic number.

287322728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

287322728 is an abundant number, since it is smaller than the sum of its proper divisors (389445112).

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

287322728 is a wasteful number, since it uses less digits than its factorization.

287322728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42438 (or 42423 counting only the distinct ones).

The product of its digits is 150528, while the sum is 41.

The square root of 287322728 is about 16950.5966856627. The cubic root of 287322728 is about 659.8673807609.

The spelling of 287322728 in words is "two hundred eighty-seven million, three hundred twenty-two thousand, seven hundred twenty-eight".