228105720 has 160 divisors (see below), whose sum is σ = 800284320. Its totient is φ = 58164480.

The previous prime is 228105707. The next prime is 228105727. The reversal of 228105720 is 27501822.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228105727) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 72990 + ... + 76050.

It is an arithmetic number, because the mean of its divisors is an integer number (5001777).

Almost surely, 2^228105720 is an apocalyptic number.

228105720 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 228105720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (400142160).

228105720 is an abundant number, since it is smaller than the sum of its proper divisors (572178600).

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

228105720 is a wasteful number, since it uses less digits than its factorization.

228105720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107 (or 3094 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 228105720 is about 15103.1692038459. The cubic root of 228105720 is about 611.0058831734.

The spelling of 228105720 in words is "two hundred twenty-eight million, one hundred five thousand, seven hundred twenty".