228194820 has 120 divisors (see below), whose sum is σ = 818161344. Its totient is φ = 52156224.

The previous prime is 228194819. The next prime is 228194849. The reversal of 228194820 is 28491822.

228194820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1279 + ... + 21401.

Almost surely, 2^228194820 is an apocalyptic number.

228194820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228194820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (409080672).

228194820 is an abundant number, since it is smaller than the sum of its proper divisors (589966524).

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

228194820 is a wasteful number, since it uses less digits than its factorization.

228194820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20151 (or 20140 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 228194820 is about 15106.1186278938. The cubic root of 228194820 is about 611.0854274850.

The spelling of 228194820 in words is "two hundred twenty-eight million, one hundred ninety-four thousand, eight hundred twenty".