878581 has 12 divisors (see below), whose sum is σ = 991116. Its totient is φ = 777920.

The previous prime is 878573. The next prime is 878593. The reversal of 878581 is 185878.

It can be written as a sum of positive squares in 2 ways, for example, as 576081 + 302500 = 759^2 + 550^2 .

It is not a de Polignac number, because 878581 - 2³ = 878573 is a prime.

It is a super-2 number, since 2×878581² = 1543809147122, which contains 22 as substring.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 878581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6345 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (82593).

2⁸⁷⁸⁵⁸¹ is an apocalyptic number.

It is an amenable number.

878581 is a deficient number, since it is larger than the sum of its proper divisors (112535).

878581 is a wasteful number, since it uses less digits than its factorization.

878581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 201 counting only the distinct ones).

The product of its digits is 17920, while the sum is 37.

The square root of 878581 is about 937.3265172820. The cubic root of 878581 is about 95.7768616675.

It can be divided in two parts, 87 and 8581, that added together give a palindrome (8668).

The spelling of 878581 in words is "eight hundred seventy-eight thousand, five hundred eighty-one".