78684396 has 72 divisors (see below), whose sum is σ = 224844480. Its totient is φ = 21295008.

The previous prime is 78684391. The next prime is 78684413. The reversal of 78684396 is 69348687.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (78684391) 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 23 ways as a sum of consecutive naturals, for example, 7651 + ... + 14693.

It is an arithmetic number, because the mean of its divisors is an integer number (3122840).

Almost surely, 2^78684396 is an apocalyptic number.

78684396 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78684396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112422240).

78684396 is an abundant number, since it is smaller than the sum of its proper divisors (146160084).

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

78684396 is a wasteful number, since it uses less digits than its factorization.

78684396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7083 (or 7074 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The square root of 78684396 is about 8870.4225378502. The cubic root of 78684396 is about 428.5118849975.

The spelling of 78684396 in words is "seventy-eight million, six hundred eighty-four thousand, three hundred ninety-six".