76728347 has 4 divisors (see below), whose sum is σ = 76778520. Its totient is φ = 76678176.

The previous prime is 76728331. The next prime is 76728349. The reversal of 76728347 is 74382767.

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 76728347 - 2⁴ = 76728331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 76728298 and 76728307.

It is not an unprimeable number, because it can be changed into a prime (76728349) 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 in 3 ways as a sum of consecutive naturals, for example, 22718 + ... + 25875.

It is an arithmetic number, because the mean of its divisors is an integer number (19194630).

Almost surely, 2^76728347 is an apocalyptic number.

76728347 is a deficient number, since it is larger than the sum of its proper divisors (50173).

76728347 is a wasteful number, since it uses less digits than its factorization.

76728347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50172.

The product of its digits is 395136, while the sum is 44.

The square root of 76728347 is about 8759.4718448089. The cubic root of 76728347 is about 424.9311943976.

The spelling of 76728347 in words is "seventy-six million, seven hundred twenty-eight thousand, three hundred forty-seven".