78728328 has 64 divisors (see below), whose sum is σ = 249936000. Its totient is φ = 22493376.

The previous prime is 78728297. The next prime is 78728329. The reversal of 78728328 is 82382787.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (78728329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24523 + ... + 27546.

It is an arithmetic number, because the mean of its divisors is an integer number (3905250).

Almost surely, 2^78728328 is an apocalyptic number.

It is an amenable number.

78728328 is an abundant number, since it is smaller than the sum of its proper divisors (171207672).

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

78728328 is a wasteful number, since it uses less digits than its factorization.

78728328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52091 (or 52081 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 78728328 is about 8872.8985117604. The cubic root of 78728328 is about 428.5916207629.

The spelling of 78728328 in words is "seventy-eight million, seven hundred twenty-eight thousand, three hundred twenty-eight".