228708681 has 16 divisors (see below), whose sum is σ = 321350400. Its totient is φ = 144287568.

The previous prime is 228708673. The next prime is 228708691. The reversal of 228708681 is 186807822.

It is not a de Polignac number, because 228708681 - 2³ = 228708673 is a prime.

It is a super-2 number, since 2×228708681² = 104615321529519522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (228708611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70170 + ... + 73356.

It is an arithmetic number, because the mean of its divisors is an integer number (20084400).

Almost surely, 2^228708681 is an apocalyptic number.

It is an amenable number.

228708681 is a deficient number, since it is larger than the sum of its proper divisors (92641719).

228708681 is a wasteful number, since it uses less digits than its factorization.

228708681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468.

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 228708681 is about 15123.1174365605. The cubic root of 228708681 is about 611.5437749615.

The spelling of 228708681 in words is "two hundred twenty-eight million, seven hundred eight thousand, six hundred eighty-one".