228099840 has 144 divisors (see below), whose sum is σ = 734662656. Its totient is φ = 60313600.

The previous prime is 228099827. The next prime is 228099847. The reversal of 228099840 is 48990822.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 228099792 and 228099801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228099847) 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, 733285 + ... + 733595.

It is an arithmetic number, because the mean of its divisors is an integer number (5101824).

Almost surely, 2^228099840 is an apocalyptic number.

228099840 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 228099840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367331328).

228099840 is an abundant number, since it is smaller than the sum of its proper divisors (506562816).

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

228099840 is a wasteful number, since it uses less digits than its factorization.

228099840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 228099840 is about 15102.9745414604. The cubic root of 228099840 is about 611.0006330560. Note that the first 3 decimals are identical.

The spelling of 228099840 in words is "two hundred twenty-eight million, ninety-nine thousand, eight hundred forty".