228420155 has 8 divisors (see below), whose sum is σ = 274192512. Its totient is φ = 182677248.

The previous prime is 228420133. The next prime is 228420161. The reversal of 228420155 is 551024822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228420155 - 2¹⁶ = 228354619 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 17099 + ... + 27371.

It is an arithmetic number, because the mean of its divisors is an integer number (34274064).

Almost surely, 2^228420155 is an apocalyptic number.

228420155 is a deficient number, since it is larger than the sum of its proper divisors (45772357).

228420155 is a wasteful number, since it uses less digits than its factorization.

228420155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14725.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 228420155 is about 15113.5751892132. The cubic root of 228420155 is about 611.2865036754.

Adding to 228420155 its reverse (551024822), we get a palindrome (779444977).

The spelling of 228420155 in words is "two hundred twenty-eight million, four hundred twenty thousand, one hundred fifty-five".