78443964 has 60 divisors (see below), whose sum is σ = 207609864. Its totient is φ = 25824096.

The previous prime is 78443941. The next prime is 78443969. The reversal of 78443964 is 46934487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78443969) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25434 + ... + 28350.

Almost surely, 2^78443964 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 78443964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103804932).

78443964 is an abundant number, since it is smaller than the sum of its proper divisors (129165900).

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

78443964 is a wasteful number, since it uses less digits than its factorization.

78443964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3016 (or 3005 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 78443964 is about 8856.8597143683. The cubic root of 78443964 is about 428.0749788576.

The spelling of 78443964 in words is "seventy-eight million, four hundred forty-three thousand, nine hundred sixty-four".