228158781 has 16 divisors (see below), whose sum is σ = 317792256. Its totient is φ = 145330416.

The previous prime is 228158771. The next prime is 228158789. The reversal of 228158781 is 187851822.

It is not a de Polignac number, because 228158781 - 2²¹ = 226061629 is a prime.

It is a super-2 number, since 2×228158781² = 104112858694811922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228158789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105396 + ... + 107538.

It is an arithmetic number, because the mean of its divisors is an integer number (19862016).

Almost surely, 2^228158781 is an apocalyptic number.

It is an amenable number.

228158781 is a deficient number, since it is larger than the sum of its proper divisors (89633475).

228158781 is a wasteful number, since it uses less digits than its factorization.

228158781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3712.

The product of its digits is 71680, while the sum is 42.

The square root of 228158781 is about 15104.9257197776. The cubic root of 228158781 is about 611.0532560460.

The spelling of 228158781 in words is "two hundred twenty-eight million, one hundred fifty-eight thousand, seven hundred eighty-one".