287878779 has 10 divisors (see below), whose sum is σ = 430041260. Its totient is φ = 191919132.

The previous prime is 287878771. The next prime is 287878781. The reversal of 287878779 is 977878782.

It is not a de Polignac number, because 287878779 - 2³ = 287878771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287878771) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1776949 + ... + 1777110.

It is an arithmetic number, because the mean of its divisors is an integer number (43004126).

Almost surely, 2^287878779 is an apocalyptic number.

287878779 is a deficient number, since it is larger than the sum of its proper divisors (142162481).

287878779 is an equidigital number, since it uses as much as digits as its factorization.

287878779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3554071 (or 3554062 counting only the distinct ones).

The product of its digits is 22127616, while the sum is 63.

The square root of 287878779 is about 16966.9908646171. The cubic root of 287878779 is about 660.2927833220.

The spelling of 287878779 in words is "two hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred seventy-nine".