228236561280 has 1152 divisors, whose sum is σ = 994850700480. Its totient is φ = 46947631104.

The previous prime is 228236561249. The next prime is 228236561299. The reversal of 228236561280 is 82165632822.

228236561280 is a `hidden beast` number, since 2 + 2 + 8 + 2 + 3 + 6 + 561 + 2 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2352954192 + ... + 2352954288.

Almost surely, 2^228236561280 is an apocalyptic number.

228236561280 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 228236561280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (497425350240).

228236561280 is an abundant number, since it is smaller than the sum of its proper divisors (766614139200).

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

228236561280 is a wasteful number, since it uses less digits than its factorization.

228236561280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 228236561280 in words is "two hundred twenty-eight billion, two hundred thirty-six million, five hundred sixty-one thousand, two hundred eighty".