78785728 has 112 divisors (see below), whose sum is σ = 189179200. Its totient is φ = 32514048.

The previous prime is 78785713. The next prime is 78785731. The reversal of 78785728 is 82758787.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 812176 + ... + 812272.

It is an arithmetic number, because the mean of its divisors is an integer number (1689100).

Almost surely, 2^78785728 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 78785728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94589600).

78785728 is an abundant number, since it is smaller than the sum of its proper divisors (110393472).

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

78785728 is an equidigital number, since it uses as much as digits as its factorization.

78785728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 143 counting only the distinct ones).

The product of its digits is 1756160, while the sum is 52.

The square root of 78785728 is about 8876.1324911247. The cubic root of 78785728 is about 428.6957560141.

The spelling of 78785728 in words is "seventy-eight million, seven hundred eighty-five thousand, seven hundred twenty-eight".