228911280 has 80 divisors (see below), whose sum is σ = 764221920. Its totient is φ = 56346624.

The previous prime is 228911279. The next prime is 228911303. The reversal of 228911280 is 82119822.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×228911280³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 15 ways as a sum of consecutive naturals, for example, 33565 + ... + 39804.

It is an arithmetic number, because the mean of its divisors is an integer number (9552774).

Almost surely, 2^228911280 is an apocalyptic number.

228911280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228911280 is an abundant number, since it is smaller than the sum of its proper divisors (535310640).

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

228911280 is a wasteful number, since it uses less digits than its factorization.

228911280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73398 (or 73392 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 228911280 is about 15129.8142751324. The cubic root of 228911280 is about 611.7242980475.

The spelling of 228911280 in words is "two hundred twenty-eight million, nine hundred eleven thousand, two hundred eighty".