278158 has 4 divisors (see below), whose sum is σ = 417240. Its totient is φ = 139078.

The previous prime is 278149. The next prime is 278177. The reversal of 278158 is 851872.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69538 + ... + 69541.

It is an arithmetic number, because the mean of its divisors is an integer number (104310).

2²⁷⁸¹⁵⁸ is an apocalyptic number.

278158 is a deficient number, since it is larger than the sum of its proper divisors (139082).

278158 is a wasteful number, since it uses less digits than its factorization.

278158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139081.

The product of its digits is 4480, while the sum is 31.

The square root of 278158 is about 527.4068638158. The cubic root of 278158 is about 65.2775508400.

The spelling of 278158 in words is "two hundred seventy-eight thousand, one hundred fifty-eight".