228137140 has 72 divisors (see below), whose sum is σ = 607999392. Its totient is φ = 71104320.

The previous prime is 228137137. The next prime is 228137149. The reversal of 228137140 is 41731822.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 228137099 and 228137108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228137149) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 199 + ... + 21361.

It is an arithmetic number, because the mean of its divisors is an integer number (8444436).

Almost surely, 2^228137140 is an apocalyptic number.

228137140 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 228137140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303999696).

228137140 is an abundant number, since it is smaller than the sum of its proper divisors (379862252).

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

228137140 is a wasteful number, since it uses less digits than its factorization.

228137140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21197 (or 21188 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 228137140 is about 15104.2093470661. The cubic root of 228137140 is about 611.0339358434.

Adding to 228137140 its reverse (41731822), we get a palindrome (269868962).

The spelling of 228137140 in words is "two hundred twenty-eight million, one hundred thirty-seven thousand, one hundred forty".