287628705 has 96 divisors (see below), whose sum is σ = 633150720. Its totient is φ = 121305600.

The previous prime is 287628703. The next prime is 287628743. The reversal of 287628705 is 507826782.

It is not a de Polignac number, because 287628705 - 2¹ = 287628703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287628701) 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 95 ways as a sum of consecutive naturals, for example, 158805 + ... + 160605.

It is an arithmetic number, because the mean of its divisors is an integer number (6595320).

Almost surely, 2^287628705 is an apocalyptic number.

It is an amenable number.

287628705 is an abundant number, since it is smaller than the sum of its proper divisors (345522015).

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

287628705 is a wasteful number, since it uses less digits than its factorization.

287628705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848 (or 1829 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 287628705 is about 16959.6198365411. The cubic root of 287628705 is about 660.1015339661.

The spelling of 287628705 in words is "two hundred eighty-seven million, six hundred twenty-eight thousand, seven hundred five".