287787225 has 24 divisors (see below), whose sum is σ = 519064992. Its totient is φ = 139532800.

The previous prime is 287787209. The next prime is 287787239. The reversal of 287787225 is 522787782.

It is not a de Polignac number, because 287787225 - 2⁴ = 287787209 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 173592 + ... + 175241.

It is an arithmetic number, because the mean of its divisors is an integer number (21627708).

Almost surely, 2^287787225 is an apocalyptic number.

287787225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

287787225 is a deficient number, since it is larger than the sum of its proper divisors (231277767).

287787225 is a wasteful number, since it uses less digits than its factorization.

287787225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348857 (or 348852 counting only the distinct ones).

The product of its digits is 878080, while the sum is 48.

The square root of 287787225 is about 16964.2926466151. The cubic root of 287787225 is about 660.2227783296. Note that the first 3 decimals are identical.

The spelling of 287787225 in words is "two hundred eighty-seven million, seven hundred eighty-seven thousand, two hundred twenty-five".