78819378 has 32 divisors (see below), whose sum is σ = 182088000. Its totient is φ = 22479360.

The previous prime is 78819371. The next prime is 78819383. The reversal of 78819378 is 87391887.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 78819378.

It is not an unprimeable number, because it can be changed into a prime (78819371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34003 + ... + 36246.

It is an arithmetic number, because the mean of its divisors is an integer number (5690250).

Almost surely, 2^78819378 is an apocalyptic number.

78819378 is an abundant number, since it is smaller than the sum of its proper divisors (103268622).

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

78819378 is a wasteful number, since it uses less digits than its factorization.

78819378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70282.

The product of its digits is 677376, while the sum is 51.

The square root of 78819378 is about 8878.0278215378. The cubic root of 78819378 is about 428.7567804292.

It can be divided in two parts, 78819 and 378, that added together give a palindrome (79197).

The spelling of 78819378 in words is "seventy-eight million, eight hundred nineteen thousand, three hundred seventy-eight".