161017280 has 56 divisors (see below), whose sum is σ = 396666720. Its totient is φ = 62182400.

The previous prime is 161017249. The next prime is 161017301. The reversal of 161017280 is 82710161.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 605 + ... + 17955.

Almost surely, 2^161017280 is an apocalyptic number.

161017280 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 161017280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198333360).

161017280 is an abundant number, since it is smaller than the sum of its proper divisors (235649440).

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

161017280 is a wasteful number, since it uses less digits than its factorization.

161017280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17397 (or 17387 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 161017280 is about 12689.2584495706. The cubic root of 161017280 is about 544.0316446413.

The spelling of 161017280 in words is "one hundred sixty-one million, seventeen thousand, two hundred eighty".