161227800 has 192 divisors, whose sum is σ = 564324000. Its totient is φ = 42301440.

The previous prime is 161227793. The next prime is 161227811. The reversal of 161227800 is 8722161.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 393996 + ... + 394404.

Almost surely, 2^161227800 is an apocalyptic number.

161227800 is a gapful number since it is divisible by the number (10) 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 161227800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282162000).

161227800 is an abundant number, since it is smaller than the sum of its proper divisors (403096200).

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

161227800 is a wasteful number, since it uses less digits than its factorization.

161227800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 161227800 is about 12697.5509449657. The cubic root of 161227800 is about 544.2686371443.

Adding to 161227800 its reverse (8722161), we get a palindrome (169949961).

The spelling of 161227800 in words is "one hundred sixty-one million, two hundred twenty-seven thousand, eight hundred".