287781887 has 2 divisors, whose sum is σ = 287781888. Its totient is φ = 287781886.

The previous prime is 287781869. The next prime is 287781913. The reversal of 287781887 is 788187782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 287781887 - 2⁸ = 287781631 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287781827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143890943 + 143890944.

It is an arithmetic number, because the mean of its divisors is an integer number (143890944).

Almost surely, 2^287781887 is an apocalyptic number.

287781887 is a deficient number, since it is larger than the sum of its proper divisors (1).

287781887 is an equidigital number, since it uses as much as digits as its factorization.

287781887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2809856, while the sum is 56.

The square root of 287781887 is about 16964.1353154235. The cubic root of 287781887 is about 660.2186962733.

The spelling of 287781887 in words is "two hundred eighty-seven million, seven hundred eighty-one thousand, eight hundred eighty-seven".