161869280 has 48 divisors (see below), whose sum is σ = 383763744. Its totient is φ = 64519680.

The previous prime is 161869277. The next prime is 161869289. The reversal of 161869280 is 82968161.

It is a super-3 number, since 3×161869280³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161869289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48134 + ... + 51386.

It is an arithmetic number, because the mean of its divisors is an integer number (7995078).

Almost surely, 2^161869280 is an apocalyptic number.

161869280 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 161869280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191881872).

161869280 is an abundant number, since it is smaller than the sum of its proper divisors (221894464).

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

161869280 is a wasteful number, since it uses less digits than its factorization.

161869280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3579 (or 3571 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 161869280 is about 12722.7858584510. The cubic root of 161869280 is about 544.9895124655.

The spelling of 161869280 in words is "one hundred sixty-one million, eight hundred sixty-nine thousand, two hundred eighty".