287381666 has 32 divisors (see below), whose sum is σ = 510148800. Its totient is φ = 119695680.

The previous prime is 287381621. The next prime is 287381723. The reversal of 287381666 is 666183782.

287381666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 287381666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36140 + ... + 43368.

It is an arithmetic number, because the mean of its divisors is an integer number (15942150).

Almost surely, 2^287381666 is an apocalyptic number.

287381666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

287381666 is a deficient number, since it is larger than the sum of its proper divisors (222767134).

287381666 is a wasteful number, since it uses less digits than its factorization.

287381666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7394.

The product of its digits is 580608, while the sum is 47.

The square root of 287381666 is about 16952.3351193869. The cubic root of 287381666 is about 659.9124968168.

The spelling of 287381666 in words is "two hundred eighty-seven million, three hundred eighty-one thousand, six hundred sixty-six".