228731745312 has 144 divisors (see below), whose sum is σ = 743600108160. Its totient is φ = 65332417536.

The previous prime is 228731745251. The next prime is 228731745329. The reversal of 228731745312 is 213547137822.

228731745312 is a `hidden beast` number, since 2 + 2 + 87 + 31 + 7 + 4 + 531 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×228731745312² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7583253 + ... + 7613355.

It is an arithmetic number, because the mean of its divisors is an integer number (5163889640).

Almost surely, 2^228731745312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228731745312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371800054080).

228731745312 is an abundant number, since it is smaller than the sum of its proper divisors (514868362848).

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

228731745312 is a wasteful number, since it uses less digits than its factorization.

228731745312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33895 (or 33884 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The spelling of 228731745312 in words is "two hundred twenty-eight billion, seven hundred thirty-one million, seven hundred forty-five thousand, three hundred twelve".