878721 has 8 divisors (see below), whose sum is σ = 1186080. Its totient is φ = 578592.

The previous prime is 878719. The next prime is 878737. The reversal of 878721 is 127878.

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

It is not a de Polignac number, because 878721 - 2¹ = 878719 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (878021) 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, 1516 + ... + 2013.

It is an arithmetic number, because the mean of its divisors is an integer number (148260).

2⁸⁷⁸⁷²¹ is an apocalyptic number.

It is an amenable number.

878721 is a deficient number, since it is larger than the sum of its proper divisors (307359).

878721 is a wasteful number, since it uses less digits than its factorization.

878721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3615.

The product of its digits is 6272, while the sum is 33.

The square root of 878721 is about 937.4011947933. The cubic root of 878721 is about 95.7819486766.

The spelling of 878721 in words is "eight hundred seventy-eight thousand, seven hundred twenty-one".