287864028 has 36 divisors (see below), whose sum is σ = 730722720. Its totient is φ = 95550336.

The previous prime is 287864023. The next prime is 287864051. The reversal of 287864028 is 820468782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287864023) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 8125 + ... + 25332.

Almost surely, 2^287864028 is an apocalyptic number.

It is an amenable number.

287864028 is an abundant number, since it is smaller than the sum of its proper divisors (442858692).

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

287864028 is a wasteful number, since it uses less digits than its factorization.

287864028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33706 (or 33701 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The square root of 287864028 is about 16966.5561620501. The cubic root of 287864028 is about 660.2815052588.

The spelling of 287864028 in words is "two hundred eighty-seven million, eight hundred sixty-four thousand, twenty-eight".