287199985000 has 40 divisors (see below), whose sum is σ = 672909576570. Its totient is φ = 114879992000.

The previous prime is 287199984983. The next prime is 287199985021. The reversal of 287199985000 is 589991782.

It can be written as a sum of positive squares in 5 ways, for example, as 1216753924 + 285983231076 = 34882^2 + 534774^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 28714999 + ... + 28724998.

Almost surely, 2^287199985000 is an apocalyptic number.

287199985000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287199985000 is an abundant number, since it is smaller than the sum of its proper divisors (385709591570).

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

287199985000 is an equidigital number, since it uses as much as digits as its factorization.

287199985000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57440023 (or 57440004 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 58.

The spelling of 287199985000 in words is "two hundred eighty-seven billion, one hundred ninety-nine million, nine hundred eighty-five thousand".