228203136 has 128 divisors (see below), whose sum is σ = 769814400. Its totient is φ = 65193984.

The previous prime is 228203083. The next prime is 228203147. The reversal of 228203136 is 631302822.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19476 + ... + 28908.

It is an arithmetic number, because the mean of its divisors is an integer number (6014175).

Almost surely, 2^228203136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228203136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (384907200).

228203136 is an abundant number, since it is smaller than the sum of its proper divisors (541611264).

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

228203136 is an equidigital number, since it uses as much as digits as its factorization.

228203136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9463 (or 9445 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 228203136 is about 15106.3938780902. The cubic root of 228203136 is about 611.0928505643.

Adding to 228203136 its reverse (631302822), we get a palindrome (859505958).

The spelling of 228203136 in words is "two hundred twenty-eight million, two hundred three thousand, one hundred thirty-six".