228371640 has 256 divisors, whose sum is σ = 846720000. Its totient is φ = 48107520.

The previous prime is 228371629. The next prime is 228371641. The reversal of 228371640 is 46173822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228371641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 654186 + ... + 654534.

It is an arithmetic number, because the mean of its divisors is an integer number (3307500).

Almost surely, 2^228371640 is an apocalyptic number.

228371640 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 228371640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (423360000).

228371640 is an abundant number, since it is smaller than the sum of its proper divisors (618348360).

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

228371640 is a wasteful number, since it uses less digits than its factorization.

228371640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 228371640 is about 15111.9700899651. The cubic root of 228371640 is about 611.2432228120.

The spelling of 228371640 in words is "two hundred twenty-eight million, three hundred seventy-one thousand, six hundred forty".