228428869 has 2 divisors, whose sum is σ = 228428870. Its totient is φ = 228428868.

The previous prime is 228428833. The next prime is 228428897. The reversal of 228428869 is 968824822.

228428869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155326369 + 73102500 = 12463^2 + 8550^2 .

It is a cyclic number.

It is not a de Polignac number, because 228428869 - 2²⁵ = 194874437 is a prime.

It is a super-2 number, since 2×228428869² = 104359496385238322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228428069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114214434 + 114214435.

It is an arithmetic number, because the mean of its divisors is an integer number (114214435).

Almost surely, 2^228428869 is an apocalyptic number.

It is an amenable number.

228428869 is a deficient number, since it is larger than the sum of its proper divisors (1).

228428869 is an equidigital number, since it uses as much as digits as its factorization.

228428869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 884736, while the sum is 49.

The square root of 228428869 is about 15113.8634703374. The cubic root of 228428869 is about 611.2942768991.

The spelling of 228428869 in words is "two hundred twenty-eight million, four hundred twenty-eight thousand, eight hundred sixty-nine".