78928547 has 4 divisors (see below), whose sum is σ = 78965040. Its totient is φ = 78892056.

The previous prime is 78928541. The next prime is 78928561. The reversal of 78928547 is 74582987.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78928547 - 2⁶ = 78928483 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78928495 and 78928504.

It is not an unprimeable number, because it can be changed into a prime (78928541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14783 + ... + 19400.

It is an arithmetic number, because the mean of its divisors is an integer number (19741260).

Almost surely, 2^78928547 is an apocalyptic number.

78928547 is a deficient number, since it is larger than the sum of its proper divisors (36493).

78928547 is a wasteful number, since it uses less digits than its factorization.

78928547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36492.

The product of its digits is 1128960, while the sum is 50.

The square root of 78928547 is about 8884.1739627272. The cubic root of 78928547 is about 428.9546393684.

The spelling of 78928547 in words is "seventy-eight million, nine hundred twenty-eight thousand, five hundred forty-seven".