306788 has 6 divisors (see below), whose sum is σ = 536886. Its totient is φ = 153392.

The previous prime is 306781. The next prime is 306809. The reversal of 306788 is 887603.

It can be written as a sum of positive squares in only one way, i.e., 238144 + 68644 = 488^2 + 262^2 .

It is an Ulam number.

It is a nialpdrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 306788.

It is not an unprimeable number, because it can be changed into a prime (306781) by changing a digit.

306788 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, 38345 + ... + 38352.

It is an arithmetic number, because the mean of its divisors is an integer number (89481).

2³⁰⁶⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

306788 is a deficient number, since it is larger than the sum of its proper divisors (230098).

306788 is a wasteful number, since it uses less digits than its factorization.

306788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76701 (or 76699 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 306788 is about 553.8844644870. The cubic root of 306788 is about 67.4444352970. Note that the first 4 decimals are identical.

The spelling of 306788 in words is "three hundred six thousand, seven hundred eighty-eight".