78028 has 6 divisors (see below), whose sum is σ = 136556. Its totient is φ = 39012.

The previous prime is 78017. The next prime is 78031. The reversal of 78028 is 82087.

78028 is nontrivially palindromic in base 13.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 77993 and 78011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9750 + ... + 9757.

2⁷⁸⁰²⁸ is an apocalyptic number.

It is an amenable number.

78028 is a deficient number, since it is larger than the sum of its proper divisors (58528).

78028 is a wasteful number, since it uses less digits than its factorization.

78028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19511 (or 19509 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 78028 is about 279.3349244187. The cubic root of 78028 is about 42.7316987884.

It can be divided in two parts, 780 and 28, that added together give a palindrome (808).

The spelling of 78028 in words is "seventy-eight thousand, twenty-eight".