228400382781 has 12 divisors (see below), whose sum is σ = 329995811808. Its totient is φ = 152228084424.

The previous prime is 228400382747. The next prime is 228400382807. The reversal of 228400382781 is 187283004822.

228400382781 is a `hidden beast` number, since 228 + 40 + 0 + 382 + 7 + 8 + 1 = 666.

It is not a de Polignac number, because 228400382781 - 2⁷ = 228400382653 is a prime.

It is a super-2 number, since 2×228400382781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228400382741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3199185 + ... + 3269798.

It is an arithmetic number, because the mean of its divisors is an integer number (27499650984).

Almost surely, 2^228400382781 is an apocalyptic number.

It is an amenable number.

228400382781 is a deficient number, since it is larger than the sum of its proper divisors (101595429027).

228400382781 is a wasteful number, since it uses less digits than its factorization.

228400382781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6472912 (or 6472909 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The spelling of 228400382781 in words is "two hundred twenty-eight billion, four hundred million, three hundred eighty-two thousand, seven hundred eighty-one".