78989728 has 24 divisors (see below), whose sum is σ = 162273888. Its totient is φ = 37777344.

The previous prime is 78989653. The next prime is 78989737. The reversal of 78989728 is 82798987.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 52926 + ... + 54397.

It is an arithmetic number, because the mean of its divisors is an integer number (6761412).

Almost surely, 2^78989728 is an apocalyptic number.

It is an amenable number.

78989728 is an abundant number, since it is smaller than the sum of its proper divisors (83284160).

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

78989728 is a wasteful number, since it uses less digits than its factorization.

78989728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107356 (or 107348 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 58.

The square root of 78989728 is about 8887.6165533848. The cubic root of 78989728 is about 429.0654446337.

The spelling of 78989728 in words is "seventy-eight million, nine hundred eighty-nine thousand, seven hundred twenty-eight".