78628 has 12 divisors (see below), whose sum is σ = 150192. Its totient is φ = 35720.

The previous prime is 78623. The next prime is 78643. The reversal of 78628 is 82687.

It is a self number, because there is not a number n which added to its sum of digits gives 78628.

It is not an unprimeable number, because it can be changed into a prime (78623) by changing a digit.

78628 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 in 3 ways as a sum of consecutive naturals, for example, 850 + ... + 937.

It is an arithmetic number, because the mean of its divisors is an integer number (12516).

2⁷⁸⁶²⁸ is an apocalyptic number.

It is an amenable number.

78628 is a deficient number, since it is larger than the sum of its proper divisors (71564).

78628 is a wasteful number, since it uses less digits than its factorization.

78628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802 (or 1800 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 78628 is about 280.4068472773. The cubic root of 78628 is about 42.8409483787.

It can be divided in two parts, 78 and 628, that multiplied together give a palindrome (48984).

The spelling of 78628 in words is "seventy-eight thousand, six hundred twenty-eight".