228631428 has 18 divisors (see below), whose sum is σ = 577929534. Its totient is φ = 76210464.

The previous prime is 228631421. The next prime is 228631433. The reversal of 228631428 is 824136822.

228631428 is a `hidden beast` number, since 228 + 6 + 3 + 1 + 428 = 666.

It can be written as a sum of positive squares in only one way, i.e., 123609924 + 105021504 = 11118^2 + 10248^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 6350873 = 228631428 / (2 + 2 + 8 + 6 + 3 + 1 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 228631392 and 228631401.

It is not an unprimeable number, because it can be changed into a prime (228631421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3175401 + ... + 3175472.

Almost surely, 2^228631428 is an apocalyptic number.

It is an amenable number.

228631428 is an abundant number, since it is smaller than the sum of its proper divisors (349298106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228631428 is a wasteful number, since it uses less digits than its factorization.

228631428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6350883 (or 6350878 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 228631428 is about 15120.5630847532. The cubic root of 228631428 is about 611.4749116498.

The spelling of 228631428 in words is "two hundred twenty-eight million, six hundred thirty-one thousand, four hundred twenty-eight".