78439616 has 56 divisors (see below), whose sum is σ = 161300160. Its totient is φ = 37824512.

The previous prime is 78439597. The next prime is 78439643. The reversal of 78439616 is 61693487.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 267566 + ... + 267858.

It is an arithmetic number, because the mean of its divisors is an integer number (2880360).

Almost surely, 2^78439616 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 78439616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80650080).

78439616 is an abundant number, since it is smaller than the sum of its proper divisors (82860544).

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

78439616 is a wasteful number, since it uses less digits than its factorization.

78439616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 431 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 78439616 is about 8856.6142515072. The cubic root of 78439616 is about 428.0670695837.

The spelling of 78439616 in words is "seventy-eight million, four hundred thirty-nine thousand, six hundred sixteen".