305678 has 4 divisors (see below), whose sum is σ = 458520. Its totient is φ = 152838.

The previous prime is 305663. The next prime is 305717. The reversal of 305678 is 876503.

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

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 305678.

It is a congruent number.

It is an unprimeable number.

305678 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76418 + ... + 76421.

It is an arithmetic number, because the mean of its divisors is an integer number (114630).

2³⁰⁵⁶⁷⁸ is an apocalyptic number.

305678 is a deficient number, since it is larger than the sum of its proper divisors (152842).

305678 is a wasteful number, since it uses less digits than its factorization.

305678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152841.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 305678 is about 552.8815424664. The cubic root of 305678 is about 67.3629960038.

The spelling of 305678 in words is "three hundred five thousand, six hundred seventy-eight".