78438612 has 192 divisors, whose sum is σ = 241920000. Its totient is φ = 19643904.

The previous prime is 78438601. The next prime is 78438643. The reversal of 78438612 is 21683487.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1329439 + ... + 1329497.

It is an arithmetic number, because the mean of its divisors is an integer number (1260000).

Almost surely, 2^78438612 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 78438612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120960000).

78438612 is an abundant number, since it is smaller than the sum of its proper divisors (163481388).

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

78438612 is a wasteful number, since it uses less digits than its factorization.

78438612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 107 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 78438612 is about 8856.5575705237. The cubic root of 78438612 is about 428.0652432056.

The spelling of 78438612 in words is "seventy-eight million, four hundred thirty-eight thousand, six hundred twelve".