78158 has 4 divisors (see below), whose sum is σ = 117240. Its totient is φ = 39078.

The previous prime is 78157. The next prime is 78163. The reversal of 78158 is 85187.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85187 = 17 ⋅5011.

It is a super-2 number, since 2×78158² = 12217345928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19538 + ... + 19541.

It is an arithmetic number, because the mean of its divisors is an integer number (29310).

2⁷⁸¹⁵⁸ is an apocalyptic number.

78158 is a deficient number, since it is larger than the sum of its proper divisors (39082).

78158 is a wasteful number, since it uses less digits than its factorization.

78158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39081.

The product of its digits is 2240, while the sum is 29.

The square root of 78158 is about 279.5675231496. The cubic root of 78158 is about 42.7554169350.

Adding to 78158 its sum of digits (29), we get a palindrome (78187).

The spelling of 78158 in words is "seventy-eight thousand, one hundred fifty-eight".