228521100 has 72 divisors (see below), whose sum is σ = 689955840. Its totient is φ = 58287680.

The previous prime is 228521099. The next prime is 228521129. The reversal of 228521100 is 1125822.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9660 + ... + 23459.

It is an arithmetic number, because the mean of its divisors is an integer number (9582720).

Almost surely, 2^228521100 is an apocalyptic number.

228521100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228521100 is an abundant number, since it is smaller than the sum of its proper divisors (461434740).

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

228521100 is a wasteful number, since it uses less digits than its factorization.

228521100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33159 (or 33152 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 228521100 is about 15116.9143676876. The cubic root of 228521100 is about 611.3765383872.

Adding to 228521100 its reverse (1125822), we get a palindrome (229646922).

The spelling of 228521100 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, one hundred".