78378 has 8 divisors (see below), whose sum is σ = 156768. Its totient is φ = 26124.

The previous prime is 78367. The next prime is 78401. The reversal of 78378 is 87387.

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

78378 is an admirable number.

It is a super-2 number, since 2×78378² = 12286221768, which contains 22 as substring.

It is an unprimeable number.

78378 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6526 + ... + 6537.

It is an arithmetic number, because the mean of its divisors is an integer number (19596).

2⁷⁸³⁷⁸ is an apocalyptic number.

78378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78384).

78378 is a wasteful number, since it uses less digits than its factorization.

78378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13068.

The product of its digits is 9408, while the sum is 33.

The square root of 78378 is about 279.9607115293. The cubic root of 78378 is about 42.7954954936.

Subtracting 78378 from its reverse (87387), we obtain a palindrome (9009).

It can be divided in two parts, 783 and 78, that added together give a triangular number (861 = T₄₁).

The spelling of 78378 in words is "seventy-eight thousand, three hundred seventy-eight".