161878 has 8 divisors (see below), whose sum is σ = 251280. Its totient is φ = 78120.

The previous prime is 161873. The next prime is 161879. The reversal of 161878 is 878161.

161878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161873) by changing a digit.

161878 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1338 + ... + 1453.

It is an arithmetic number, because the mean of its divisors is an integer number (31410).

2¹⁶¹⁸⁷⁸ is an apocalyptic number.

161878 is a deficient number, since it is larger than the sum of its proper divisors (89402).

161878 is a wasteful number, since it uses less digits than its factorization.

161878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2822.

The product of its digits is 2688, while the sum is 31.

The square root of 161878 is about 402.3406516871. The cubic root of 161878 is about 54.4999298599.

The spelling of 161878 in words is "one hundred sixty-one thousand, eight hundred seventy-eight".