146220228 has 120 divisors (see below), whose sum is σ = 476650944. Its totient is φ = 37972800.

The previous prime is 146220209. The next prime is 146220229. The reversal of 146220228 is 822022641.

It is a happy number.

146220228 is a `hidden beast` number, since 14 + 622 + 0 + 2 + 28 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (146220229) 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, 22018 + ... + 27878.

Almost surely, 2^146220228 is an apocalyptic number.

146220228 is a gapful number since it is divisible by the number (18) 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 146220228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238325472).

146220228 is an abundant number, since it is smaller than the sum of its proper divisors (330430716).

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

146220228 is a wasteful number, since it uses less digits than its factorization.

146220228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5895 (or 5884 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 146220228 is about 12092.1556390910. The cubic root of 146220228 is about 526.8283679806.

Adding to 146220228 its reverse (822022641), we get a palindrome (968242869).

The spelling of 146220228 in words is "one hundred forty-six million, two hundred twenty thousand, two hundred twenty-eight".