287978 has 8 divisors (see below), whose sum is σ = 436260. Its totient is φ = 142560.

The previous prime is 287977. The next prime is 288007. The reversal of 287978 is 879782.

It can be written as a sum of positive squares in 2 ways, for example, as 253009 + 34969 = 503^2 + 187^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287978.

It is not an unprimeable number, because it can be changed into a prime (287977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443 + ... + 878.

2²⁸⁷⁹⁷⁸ is an apocalyptic number.

287978 is a deficient number, since it is larger than the sum of its proper divisors (148282).

287978 is a wasteful number, since it uses less digits than its factorization.

287978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432.

The product of its digits is 56448, while the sum is 41.

The square root of 287978 is about 536.6358169187. The cubic root of 287978 is about 66.0368633980.

The spelling of 287978 in words is "two hundred eighty-seven thousand, nine hundred seventy-eight".