228667681 has 4 divisors (see below), whose sum is σ = 249455664. Its totient is φ = 207879700.

The previous prime is 228667669. The next prime is 228667729. The reversal of 228667681 is 186766822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 228667681 - 2¹³ = 228659489 is a prime.

It is a super-2 number, since 2×228667681² = 104577816667835522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228667601) 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 3 ways as a sum of consecutive naturals, for example, 10393975 + ... + 10393996.

It is an arithmetic number, because the mean of its divisors is an integer number (62363916).

Almost surely, 2^228667681 is an apocalyptic number.

It is an amenable number.

228667681 is a deficient number, since it is larger than the sum of its proper divisors (20787983).

228667681 is a wasteful number, since it uses less digits than its factorization.

228667681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20787982.

The product of its digits is 387072, while the sum is 46.

The square root of 228667681 is about 15121.7618351831. The cubic root of 228667681 is about 611.5072294996.

The spelling of 228667681 in words is "two hundred twenty-eight million, six hundred sixty-seven thousand, six hundred eighty-one".