228297987981 has 12 divisors (see below), whose sum is σ = 376872869152. Its totient is φ = 130455993096.

The previous prime is 228297987899. The next prime is 228297987991. The reversal of 228297987981 is 189789792822.

It is not a de Polignac number, because 228297987981 - 2³⁵ = 193938249613 is a prime.

It is a super-2 number, since 2×228297987981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228297987991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1811888731 + ... + 1811888856.

Almost surely, 2^228297987981 is an apocalyptic number.

228297987981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

228297987981 is a deficient number, since it is larger than the sum of its proper divisors (148574881171).

228297987981 is a wasteful number, since it uses less digits than its factorization.

228297987981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3623777600 (or 3623777597 counting only the distinct ones).

The product of its digits is 146313216, while the sum is 72.

The spelling of 228297987981 in words is "two hundred twenty-eight billion, two hundred ninety-seven million, nine hundred eighty-seven thousand, nine hundred eighty-one".