305878 has 4 divisors (see below), whose sum is σ = 458820. Its totient is φ = 152938.

The previous prime is 305873. The next prime is 305917. The reversal of 305878 is 878503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 878503 = 19 ⋅46237.

It is a super-2 number, since 2×305878² = 187122701768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76468 + ... + 76471.

It is an arithmetic number, because the mean of its divisors is an integer number (114705).

2³⁰⁵⁸⁷⁸ is an apocalyptic number.

305878 is a deficient number, since it is larger than the sum of its proper divisors (152942).

305878 is a wasteful number, since it uses less digits than its factorization.

305878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152941.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 305878 is about 553.0623834614. The cubic root of 305878 is about 67.3776842945.

It can be divided in two parts, 3058 and 78, that added together give a square (3136 = 56²).

The spelling of 305878 in words is "three hundred five thousand, eight hundred seventy-eight".