161562280 has 64 divisors (see below), whose sum is σ = 397872000. Its totient is φ = 58556160.

The previous prime is 161562253. The next prime is 161562287. The reversal of 161562280 is 82265161.

It is a super-2 number, since 2×161562280² = 52204740637596800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161562287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263254 + ... + 263866.

It is an arithmetic number, because the mean of its divisors is an integer number (6216750).

Almost surely, 2^161562280 is an apocalyptic number.

161562280 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 161562280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198936000).

161562280 is an abundant number, since it is smaller than the sum of its proper divisors (236309720).

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

161562280 is a wasteful number, since it uses less digits than its factorization.

161562280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234 (or 1230 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 161562280 is about 12710.7151647734. The cubic root of 161562280 is about 544.6447534806.

The spelling of 161562280 in words is "one hundred sixty-one million, five hundred sixty-two thousand, two hundred eighty".