280161882 has 256 divisors, whose sum is σ = 859299840. Its totient is φ = 65318400.

The previous prime is 280161863. The next prime is 280161883. The reversal of 280161882 is 288161082.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (280161883) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3837798 + ... + 3837870.

It is an arithmetic number, because the mean of its divisors is an integer number (3356640).

Almost surely, 2^280161882 is an apocalyptic number.

280161882 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 280161882, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (429649920).

280161882 is an abundant number, since it is smaller than the sum of its proper divisors (579137958).

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

280161882 is a wasteful number, since it uses less digits than its factorization.

280161882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 280161882 is about 16738.0369816774. The cubic root of 280161882 is about 654.3393155474.

The spelling of 280161882 in words is "two hundred eighty million, one hundred sixty-one thousand, eight hundred eighty-two".