228505641 has 16 divisors (see below), whose sum is σ = 374984064. Its totient is φ = 120530304.

The previous prime is 228505637. The next prime is 228505649. The reversal of 228505641 is 146505822.

It is not a de Polignac number, because 228505641 - 2² = 228505637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228505649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 418236 + ... + 418781.

It is an arithmetic number, because the mean of its divisors is an integer number (23436504).

Almost surely, 2^228505641 is an apocalyptic number.

228505641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

228505641 is a deficient number, since it is larger than the sum of its proper divisors (146478423).

228505641 is a wasteful number, since it uses less digits than its factorization.

228505641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837040.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 228505641 is about 15116.4030443753. The cubic root of 228505641 is about 611.3627519388.

The spelling of 228505641 in words is "two hundred twenty-eight million, five hundred five thousand, six hundred forty-one".