78847128 has 128 divisors (see below), whose sum is σ = 233280000. Its totient is φ = 24621696.

The previous prime is 78847121. The next prime is 78847157. The reversal of 78847128 is 82174887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78847121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 292978 + ... + 293246.

It is an arithmetic number, because the mean of its divisors is an integer number (1822500).

Almost surely, 2^78847128 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 78847128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116640000).

78847128 is an abundant number, since it is smaller than the sum of its proper divisors (154432872).

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

78847128 is a wasteful number, since it uses less digits than its factorization.

78847128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 356 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 78847128 is about 8879.5905311000. The cubic root of 78847128 is about 428.8070921035.

The spelling of 78847128 in words is "seventy-eight million, eight hundred forty-seven thousand, one hundred twenty-eight".