228127781 has 12 divisors (see below), whose sum is σ = 265638240. Its totient is φ = 195342840.

The previous prime is 228127763. The next prime is 228127787. The reversal of 228127781 is 187721822.

228127781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-228127781 is a prime.

It is a super-2 number, since 2×228127781² = 104084568927967922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228127787) 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, 69896 + ... + 73086.

It is an arithmetic number, because the mean of its divisors is an integer number (22136520).

Almost surely, 2^228127781 is an apocalyptic number.

It is an amenable number.

228127781 is a deficient number, since it is larger than the sum of its proper divisors (37510459).

228127781 is a wasteful number, since it uses less digits than its factorization.

228127781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4664 (or 4657 counting only the distinct ones).

The product of its digits is 25088, while the sum is 38.

The square root of 228127781 is about 15103.8995295917. The cubic root of 228127781 is about 611.0255801313.

The spelling of 228127781 in words is "two hundred twenty-eight million, one hundred twenty-seven thousand, seven hundred eighty-one".