228220225 has 12 divisors (see below), whose sum is σ = 283200624. Its totient is φ = 182442320.

The previous prime is 228220219. The next prime is 228220231. The reversal of 228220225 is 522022822.

228220225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (228220219) and next prime (228220231).

It is a de Polignac number, because none of the positive numbers 2^k-228220225 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228220225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45282 + ... + 50068.

It is an arithmetic number, because the mean of its divisors is an integer number (23600052).

Almost surely, 2^228220225 is an apocalyptic number.

228220225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

228220225 is a deficient number, since it is larger than the sum of its proper divisors (54980399).

228220225 is a wasteful number, since it uses less digits than its factorization.

228220225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6704 (or 6699 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 228220225 is about 15106.9594889243. The cubic root of 228220225 is about 611.1081040868.

The spelling of 228220225 in words is "two hundred twenty-eight million, two hundred twenty thousand, two hundred twenty-five".