161927280 has 120 divisors (see below), whose sum is σ = 546661440. Its totient is φ = 42954240.

The previous prime is 161927263. The next prime is 161927299. The reversal of 161927280 is 82729161.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 171610 + ... + 172550.

It is an arithmetic number, because the mean of its divisors is an integer number (4555512).

Almost surely, 2^161927280 is an apocalyptic number.

161927280 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 161927280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273330720).

161927280 is an abundant number, since it is smaller than the sum of its proper divisors (384734160).

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

161927280 is a wasteful number, since it uses less digits than its factorization.

161927280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199 (or 1190 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 161927280 is about 12725.0650293034. The cubic root of 161927280 is about 545.0545971171.

The spelling of 161927280 in words is "one hundred sixty-one million, nine hundred twenty-seven thousand, two hundred eighty".