281161680 has 80 divisors (see below), whose sum is σ = 881461440. Its totient is φ = 74128384.

The previous prime is 281161669. The next prime is 281161697. The reversal of 281161680 is 86161182.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14779 + ... + 27941.

It is an arithmetic number, because the mean of its divisors is an integer number (11018268).

Almost surely, 2^281161680 is an apocalyptic number.

281161680 is a gapful number since it is divisible by the number (20) 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 281161680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (440730720).

281161680 is an abundant number, since it is smaller than the sum of its proper divisors (600299760).

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

281161680 is a wasteful number, since it uses less digits than its factorization.

281161680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13268 (or 13262 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 281161680 is about 16767.8764308424. The cubic root of 281161680 is about 655.1167594818.

The spelling of 281161680 in words is "two hundred eighty-one million, one hundred sixty-one thousand, six hundred eighty".