78428843 has 4 divisors (see below), whose sum is σ = 78478848. Its totient is φ = 78378840.

The previous prime is 78428809. The next prime is 78428869. The reversal of 78428843 is 34882487.

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 78428843 - 2⁸ = 78428587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78428794 and 78428803.

It is not an unprimeable number, because it can be changed into a prime (78425843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22571 + ... + 25812.

It is an arithmetic number, because the mean of its divisors is an integer number (19619712).

Almost surely, 2^78428843 is an apocalyptic number.

78428843 is a deficient number, since it is larger than the sum of its proper divisors (50005).

78428843 is a wasteful number, since it uses less digits than its factorization.

78428843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50004.

The product of its digits is 344064, while the sum is 44.

The square root of 78428843 is about 8856.0060411000. The cubic root of 78428843 is about 428.0474715884.

The spelling of 78428843 in words is "seventy-eight million, four hundred twenty-eight thousand, eight hundred forty-three".