186720228 has 42 divisors (see below), whose sum is σ = 489924134. Its totient is φ = 62239104.

The previous prime is 186720221. The next prime is 186720253. The reversal of 186720228 is 822027681.

It is a happy number.

186720228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 185177664 + 1542564 = 13608^2 + 1242^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 186720192 and 186720201.

It is not an unprimeable number, because it can be changed into a prime (186720221) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 29101 + ... + 34932.

Almost surely, 2^186720228 is an apocalyptic number.

186720228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

186720228 is an abundant number, since it is smaller than the sum of its proper divisors (303203906).

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

186720228 is an equidigital number, since it uses as much as digits as its factorization.

186720228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64055 (or 64038 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 186720228 is about 13664.5610247823. The cubic root of 186720228 is about 571.5625822718.

The spelling of 186720228 in words is "one hundred eighty-six million, seven hundred twenty thousand, two hundred twenty-eight".