16161228 has 48 divisors (see below), whose sum is σ = 42219520. Its totient is φ = 5346000.

The previous prime is 16161209. The next prime is 16161253. The reversal of 16161228 is 82216161.

It is a super-2 number, since 2×16161228² = 522370580935968, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15813 + ... + 16803.

Almost surely, 2^16161228 is an apocalyptic number.

16161228 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 16161228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21109760).

16161228 is an abundant number, since it is smaller than the sum of its proper divisors (26058292).

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

16161228 is a wasteful number, since it uses less digits than its factorization.

16161228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155 (or 1147 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 16161228 is about 4020.1029837555. The cubic root of 16161228 is about 252.8277767842.

Adding to 16161228 its reverse (82216161), we get a palindrome (98377389).

The spelling of 16161228 in words is "sixteen million, one hundred sixty-one thousand, two hundred twenty-eight".