78278 has 4 divisors (see below), whose sum is σ = 117420. Its totient is φ = 39138.

The previous prime is 78277. The next prime is 78283. The reversal of 78278 is 87287.

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: 87287 = 191 ⋅457.

It is a super-2 number, since 2×78278² = 12254890568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19568 + ... + 19571.

It is an arithmetic number, because the mean of its divisors is an integer number (29355).

2⁷⁸²⁷⁸ is an apocalyptic number.

78278 is a deficient number, since it is larger than the sum of its proper divisors (39142).

78278 is a wasteful number, since it uses less digits than its factorization.

78278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39141.

The product of its digits is 6272, while the sum is 32.

The square root of 78278 is about 279.7820580380. The cubic root of 78278 is about 42.7772872766. Note that the first 3 decimals are identical.

Subtracting 78278 from its reverse (87287), we obtain a palindrome (9009).

The spelling of 78278 in words is "seventy-eight thousand, two hundred seventy-eight".