228131740 has 24 divisors (see below), whose sum is σ = 479862432. Its totient is φ = 91103040.

The previous prime is 228131731. The next prime is 228131747. The reversal of 228131740 is 47131822.

It is a junction number, because it is equal to n+sod(n) for n = 228131699 and 228131708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228131747) 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 7 ways as a sum of consecutive naturals, for example, 3582 + ... + 21658.

It is an arithmetic number, because the mean of its divisors is an integer number (19994268).

Almost surely, 2^228131740 is an apocalyptic number.

228131740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228131740 is an abundant number, since it is smaller than the sum of its proper divisors (251730692).

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

228131740 is a wasteful number, since it uses less digits than its factorization.

228131740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18717 (or 18715 counting only the distinct ones).

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

The square root of 228131740 is about 15104.0305878928. The cubic root of 228131740 is about 611.0291147531.

The spelling of 228131740 in words is "two hundred twenty-eight million, one hundred thirty-one thousand, seven hundred forty".