161812260 has 72 divisors (see below), whose sum is σ = 498910776. Its totient is φ = 42439680.

The previous prime is 161812253. The next prime is 161812283. The reversal of 161812260 is 62218161.

It can be written as a sum of positive squares in 4 ways, for example, as 7257636 + 154554624 = 2694^2 + 12432^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3612 + ... + 18348.

Almost surely, 2^161812260 is an apocalyptic number.

161812260 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 161812260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249455388).

161812260 is an abundant number, since it is smaller than the sum of its proper divisors (337098516).

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

161812260 is a wasteful number, since it uses less digits than its factorization.

161812260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14813 (or 14808 counting only the distinct ones).

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

The square root of 161812260 is about 12720.5447996538. The cubic root of 161812260 is about 544.9255123629.

The spelling of 161812260 in words is "one hundred sixty-one million, eight hundred twelve thousand, two hundred sixty".