878172 has 12 divisors (see below), whose sum is σ = 2049096. Its totient is φ = 292720.

The previous prime is 878167. The next prime is 878173. The reversal of 878172 is 271878.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×878172³ = 2031702018220033344, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878173) by changing a digit.

878172 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36579 + ... + 36602.

It is an arithmetic number, because the mean of its divisors is an integer number (170758).

2⁸⁷⁸¹⁷² is an apocalyptic number.

It is an amenable number.

878172 is an abundant number, since it is smaller than the sum of its proper divisors (1170924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

878172 is a wasteful number, since it uses less digits than its factorization.

878172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73188 (or 73186 counting only the distinct ones).

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

The square root of 878172 is about 937.1083181789. The cubic root of 878172 is about 95.7619972378.

The spelling of 878172 in words is "eight hundred seventy-eight thousand, one hundred seventy-two".