161025228 has 216 divisors, whose sum is σ = 532896000. Its totient is φ = 40030848.

The previous prime is 161025217. The next prime is 161025233. The reversal of 161025228 is 822520161.

It is a happy number.

161025228 is a `hidden beast` number, since 1 + 610 + 25 + 2 + 28 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 809073 + ... + 809271.

Almost surely, 2^161025228 is an apocalyptic number.

161025228 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 161025228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266448000).

161025228 is an abundant number, since it is smaller than the sum of its proper divisors (371870772).

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

161025228 is a wasteful number, since it uses less digits than its factorization.

161025228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 161025228 is about 12689.5716239753. The cubic root of 161025228 is about 544.0405958387.

Adding to 161025228 its reverse (822520161), we get a palindrome (983545389).

The spelling of 161025228 in words is "one hundred sixty-one million, twenty-five thousand, two hundred twenty-eight".