820887 has 4 divisors (see below), whose sum is σ = 1094520. Its totient is φ = 547256.

The previous prime is 820873. The next prime is 820891. The reversal of 820887 is 788028.

820887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 820887 - 2⁷ = 820759 is a prime.

It is a D-number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820837) 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, 136812 + ... + 136817.

It is an arithmetic number, because the mean of its divisors is an integer number (273630).

2⁸²⁰⁸⁸⁷ is an apocalyptic number.

820887 is a deficient number, since it is larger than the sum of its proper divisors (273633).

820887 is a wasteful number, since it uses less digits than its factorization.

820887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273632.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 820887 is about 906.0281452582. The cubic root of 820887 is about 93.6327529835.

The spelling of 820887 in words is "eight hundred twenty thousand, eight hundred eighty-seven".