872785 has 8 divisors (see below), whose sum is σ = 1054440. Its totient is φ = 693504.

The previous prime is 872761. The next prime is 872789. The reversal of 872785 is 587278.

It can be written as a sum of positive squares in 4 ways, for example, as 173889 + 698896 = 417^2 + 836^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 872785 - 2⁷ = 872657 is a prime.

It is an alternating number because its digits alternate between even and odd.

872785 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (872789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361 + ... + 1369.

It is an arithmetic number, because the mean of its divisors is an integer number (131805).

2⁸⁷²⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

872785 is a deficient number, since it is larger than the sum of its proper divisors (181655).

872785 is a wasteful number, since it uses less digits than its factorization.

872785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187.

The product of its digits is 31360, while the sum is 37.

The square root of 872785 is about 934.2296291598. The cubic root of 872785 is about 95.5657834634.

The spelling of 872785 in words is "eight hundred seventy-two thousand, seven hundred eighty-five".