228804781 has 12 divisors (see below), whose sum is σ = 237533212. Its totient is φ = 220230144.

The previous prime is 228804767. The next prime is 228804791. The reversal of 228804781 is 187408822.

228804781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 135373225 + 93431556 = 11635^2 + 9666^2 .

It is not a de Polignac number, because 228804781 - 2¹¹ = 228802733 is a prime.

It is a super-2 number, since 2×228804781² = 104703255616915922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228804721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1185421 + ... + 1185613.

Almost surely, 2^228804781 is an apocalyptic number.

It is an amenable number.

228804781 is a deficient number, since it is larger than the sum of its proper divisors (8728431).

228804781 is an equidigital number, since it uses as much as digits as its factorization.

228804781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 228804781 is about 15126.2943578393. The cubic root of 228804781 is about 611.6294168461.

The spelling of 228804781 in words is "two hundred twenty-eight million, eight hundred four thousand, seven hundred eighty-one".