228921428 has 6 divisors (see below), whose sum is σ = 400612506. Its totient is φ = 114460712.

The previous prime is 228921419. The next prime is 228921467. The reversal of 228921428 is 824129822.

It can be written as a sum of positive squares in only one way, i.e., 182844484 + 46076944 = 13522^2 + 6788^2 .

It is a junction number, because it is equal to n+sod(n) for n = 228921391 and 228921400.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 28615175 + ... + 28615182.

It is an arithmetic number, because the mean of its divisors is an integer number (66768751).

Almost surely, 2^228921428 is an apocalyptic number.

It is an amenable number.

228921428 is a deficient number, since it is larger than the sum of its proper divisors (171691078).

228921428 is a wasteful number, since it uses less digits than its factorization.

228921428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57230361 (or 57230359 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 228921428 is about 15130.1496357439. The cubic root of 228921428 is about 611.7333374833.

The spelling of 228921428 in words is "two hundred twenty-eight million, nine hundred twenty-one thousand, four hundred twenty-eight".