161481280 has 56 divisors (see below), whose sum is σ = 397809720. Its totient is φ = 62361600.

The previous prime is 161481277. The next prime is 161481311. The reversal of 161481280 is 82184161.

It can be written as a sum of positive squares in 4 ways, for example, as 22052416 + 139428864 = 4696^2 + 11808^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580 + ... + 17980.

It is an arithmetic number, because the mean of its divisors is an integer number (7103745).

Almost surely, 2^161481280 is an apocalyptic number.

161481280 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 161481280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198904860).

161481280 is an abundant number, since it is smaller than the sum of its proper divisors (236328440).

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

161481280 is a wasteful number, since it uses less digits than its factorization.

161481280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17447 (or 17437 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 161481280 is about 12707.5284772453. The cubic root of 161481280 is about 544.5537182057.

It can be divided in two parts, 1 and 61481280, that added together give a square (61481281 = 7841²).

The spelling of 161481280 in words is "one hundred sixty-one million, four hundred eighty-one thousand, two hundred eighty".