228668891 has 8 divisors (see below), whose sum is σ = 249584304. Its totient is φ = 207774720.

The previous prime is 228668863. The next prime is 228668893. The reversal of 228668891 is 198866822.

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 228668891 - 2⁶ = 228668827 is a prime.

It is a super-2 number, since 2×228668891² = 104578923422339762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228668893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24515 + ... + 32531.

It is an arithmetic number, because the mean of its divisors is an integer number (31198038).

Almost surely, 2^228668891 is an apocalyptic number.

228668891 is a deficient number, since it is larger than the sum of its proper divisors (20915413).

228668891 is a wasteful number, since it uses less digits than its factorization.

228668891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10621.

The product of its digits is 663552, while the sum is 50.

The square root of 228668891 is about 15121.8018436957. The cubic root of 228668891 is about 611.5083080989.

The spelling of 228668891 in words is "two hundred twenty-eight million, six hundred sixty-eight thousand, eight hundred ninety-one".