287949220 has 24 divisors (see below), whose sum is σ = 651208824. Its totient is φ = 106319616.

The previous prime is 287949217. The next prime is 287949229. The reversal of 287949220 is 22949782.

It can be written as a sum of positive squares in 4 ways, for example, as 850084 + 287099136 = 922^2 + 16944^2 .

It is not an unprimeable number, because it can be changed into a prime (287949229) 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 7 ways as a sum of consecutive naturals, for example, 553489 + ... + 554008.

It is an arithmetic number, because the mean of its divisors is an integer number (27133701).

Almost surely, 2^287949220 is an apocalyptic number.

287949220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287949220 is an abundant number, since it is smaller than the sum of its proper divisors (363259604).

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

287949220 is a wasteful number, since it uses less digits than its factorization.

287949220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107519 (or 1107517 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 287949220 is about 16969.0665624247. The cubic root of 287949220 is about 660.3466345657.

The spelling of 287949220 in words is "two hundred eighty-seven million, nine hundred forty-nine thousand, two hundred twenty".