286878891 has 16 divisors (see below), whose sum is σ = 433610240. Its totient is φ = 167248800.

The previous prime is 286878887. The next prime is 286878899. The reversal of 286878891 is 198878682.

It is not a de Polignac number, because 286878891 - 2² = 286878887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (286878899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192835 + ... + 194316.

It is an arithmetic number, because the mean of its divisors is an integer number (27100640).

Almost surely, 2^286878891 is an apocalyptic number.

286878891 is a deficient number, since it is larger than the sum of its proper divisors (146731349).

286878891 is a wasteful number, since it uses less digits than its factorization.

286878891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387186.

The product of its digits is 3096576, while the sum is 57.

The square root of 286878891 is about 16937.4995498155. The cubic root of 286878891 is about 659.5274326079.

The spelling of 286878891 in words is "two hundred eighty-six million, eight hundred seventy-eight thousand, eight hundred ninety-one".