78238 has 4 divisors (see below), whose sum is σ = 117360. Its totient is φ = 39118.

The previous prime is 78233. The next prime is 78241. The reversal of 78238 is 83287.

It is a happy number.

78238 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83287 = 37 ⋅2251.

It is a super-2 number, since 2×78238² = 12242369288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19558 + ... + 19561.

It is an arithmetic number, because the mean of its divisors is an integer number (29340).

2⁷⁸²³⁸ is an apocalyptic number.

78238 is a deficient number, since it is larger than the sum of its proper divisors (39122).

78238 is a wasteful number, since it uses less digits than its factorization.

78238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39121.

The product of its digits is 2688, while the sum is 28.

The square root of 78238 is about 279.7105646914. The cubic root of 78238 is about 42.7699996478.

Subtracting from 78238 its sum of digits (28), we obtain a triangular number (78210 = T₃₉₅).

It can be divided in two parts, 782 and 38, that added together give a triangular number (820 = T₄₀).

The spelling of 78238 in words is "seventy-eight thousand, two hundred thirty-eight".