78728128 has 14 divisors (see below), whose sum is σ = 156226256. Its totient is φ = 39364032.

The previous prime is 78728123. The next prime is 78728129. The reversal of 78728128 is 82182787.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78728123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615000 + ... + 615127.

Almost surely, 2^78728128 is an apocalyptic number.

It is an amenable number.

78728128 is a deficient number, since it is larger than the sum of its proper divisors (77498128).

78728128 is a wasteful number, since it uses less digits than its factorization.

78728128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230139 (or 1230129 counting only the distinct ones).

The product of its digits is 100352, while the sum is 43.

The square root of 78728128 is about 8872.8872414790. The cubic root of 78728128 is about 428.5912578338.

The spelling of 78728128 in words is "seventy-eight million, seven hundred twenty-eight thousand, one hundred twenty-eight".