287642028 has 12 divisors (see below), whose sum is σ = 671164760. Its totient is φ = 95880672.

The previous prime is 287642011. The next prime is 287642029. The reversal of 287642028 is 820246782.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (287642029) 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 3 ways as a sum of consecutive naturals, for example, 11985073 + ... + 11985096.

Almost surely, 2^287642028 is an apocalyptic number.

It is an amenable number.

287642028 is an abundant number, since it is smaller than the sum of its proper divisors (383522732).

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

287642028 is a wasteful number, since it uses less digits than its factorization.

287642028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23970176 (or 23970174 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 287642028 is about 16960.0126179198. The cubic root of 287642028 is about 660.1117258057. Note that the first 3 decimals are identical.

The spelling of 287642028 in words is "two hundred eighty-seven million, six hundred forty-two thousand, twenty-eight".