228207156 has 12 divisors (see below), whose sum is σ = 532483392. Its totient is φ = 76069048.

The previous prime is 228207131. The next prime is 228207179. The reversal of 228207156 is 651702822.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9508620 + ... + 9508643.

It is an arithmetic number, because the mean of its divisors is an integer number (44373616).

Almost surely, 2^228207156 is an apocalyptic number.

It is an amenable number.

228207156 is an abundant number, since it is smaller than the sum of its proper divisors (304276236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228207156 is a wasteful number, since it uses less digits than its factorization.

228207156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19017270 (or 19017268 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 228207156 is about 15106.5269337462. The cubic root of 228207156 is about 611.0964388568.

Adding to 228207156 its reverse (651702822), we get a palindrome (879909978).

The spelling of 228207156 in words is "two hundred twenty-eight million, two hundred seven thousand, one hundred fifty-six".