228131540 has 96 divisors (see below), whose sum is σ = 594021120. Its totient is φ = 71663616.

The previous prime is 228131479. The next prime is 228131543. The reversal of 228131540 is 45131822.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228131543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 296276 + ... + 297044.

It is an arithmetic number, because the mean of its divisors is an integer number (6187720).

Almost surely, 2^228131540 is an apocalyptic number.

228131540 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 228131540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297010560).

228131540 is an abundant number, since it is smaller than the sum of its proper divisors (365889580).

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

228131540 is a wasteful number, since it uses less digits than its factorization.

228131540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 228131540 is about 15104.0239671420. The cubic root of 228131540 is about 611.0289361927.

The spelling of 228131540 in words is "two hundred twenty-eight million, one hundred thirty-one thousand, five hundred forty".