228003656640 has 112 divisors (see below), whose sum is σ = 724793722368. Its totient is φ = 60726887424.

The previous prime is 228003656609. The next prime is 228003656659. The reversal of 228003656640 is 46656300822.

It is a happy number.

It is a super-2 number, since 2×228003656640² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 228003656592 and 228003656601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 645789 + ... + 934371.

Almost surely, 2^228003656640 is an apocalyptic number.

228003656640 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 228003656640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362396861184).

228003656640 is an abundant number, since it is smaller than the sum of its proper divisors (496790065728).

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

228003656640 is a wasteful number, since it uses less digits than its factorization.

228003656640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289426 (or 289416 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 228003656640 in words is "two hundred twenty-eight billion, three million, six hundred fifty-six thousand, six hundred forty".