78439104 has 70 divisors (see below), whose sum is σ = 232533444. Its totient is φ = 26144640.

The previous prime is 78439103. The next prime is 78439117. The reversal of 78439104 is 40193487.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (78439103) 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 9 ways as a sum of consecutive naturals, for example, 2382 + ... + 12749.

Almost surely, 2^78439104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78439104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116266722).

78439104 is an abundant number, since it is smaller than the sum of its proper divisors (154094340).

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

78439104 is a wasteful number, since it uses less digits than its factorization.

78439104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15155 (or 15136 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 78439104 is about 8856.5853465091. The cubic root of 78439104 is about 428.0661382056.

The spelling of 78439104 in words is "seventy-eight million, four hundred thirty-nine thousand, one hundred four".