287305056 has 120 divisors (see below), whose sum is σ = 850726800. Its totient is φ = 95116032.

The previous prime is 287305019. The next prime is 287305063. The reversal of 287305056 is 650503782.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 287305056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 515530 + ... + 516086.

It is an arithmetic number, because the mean of its divisors is an integer number (7089390).

Almost surely, 2^287305056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 287305056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (425363400).

287305056 is an abundant number, since it is smaller than the sum of its proper divisors (563421744).

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

287305056 is a wasteful number, since it uses less digits than its factorization.

287305056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 287305056 is about 16950.0753980624. The cubic root of 287305056 is about 659.8538519374.

The spelling of 287305056 in words is "two hundred eighty-seven million, three hundred five thousand, fifty-six".