161884280 has 32 divisors (see below), whose sum is σ = 364618800. Its totient is φ = 64686336.

The previous prime is 161884273. The next prime is 161884297. The reversal of 161884280 is 82488161.

It is a super-2 number, since 2×161884280² = 52413040222236800, which contains 22 as substring.

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, 57956 + ... + 60684.

Almost surely, 2^161884280 is an apocalyptic number.

161884280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161884280 is an abundant number, since it is smaller than the sum of its proper divisors (202734520).

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

161884280 is a wasteful number, since it uses less digits than its factorization.

161884280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223 (or 4219 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 161884280 is about 12723.3753383291. The cubic root of 161884280 is about 545.0063461933.

The spelling of 161884280 in words is "one hundred sixty-one million, eight hundred eighty-four thousand, two hundred eighty".