287728280 has 64 divisors (see below), whose sum is σ = 759896640. Its totient is φ = 95980032.

The previous prime is 287728261. The next prime is 287728289. The reversal of 287728280 is 82827782.

It is a happy number.

It is a super-2 number, since 2×287728280² = 165575126223516800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287728289) 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 15 ways as a sum of consecutive naturals, for example, 3527 + ... + 24246.

It is an arithmetic number, because the mean of its divisors is an integer number (11873385).

Almost surely, 2^287728280 is an apocalyptic number.

287728280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287728280 is an abundant number, since it is smaller than the sum of its proper divisors (472168360).

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

287728280 is a wasteful number, since it uses less digits than its factorization.

287728280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27828 (or 27824 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 44.

The square root of 287728280 is about 16962.5552320398. Note that the first 3 decimals coincide. The cubic root of 287728280 is about 660.1776993203.

The spelling of 287728280 in words is "two hundred eighty-seven million, seven hundred twenty-eight thousand, two hundred eighty".