281280000 has 200 divisors, whose sum is σ = 939580488. Its totient is φ = 74752000.

The previous prime is 281279989. The next prime is 281280121. The reversal of 281280000 is 82182.

It is a tau number, because it is divible by the number of its divisors (200).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 959854 + ... + 960146.

Almost surely, 2^281280000 is an apocalyptic number.

281280000 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 281280000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (469790244).

281280000 is an abundant number, since it is smaller than the sum of its proper divisors (658300488).

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

281280000 is an frugal number, since it uses more digits than its factorization.

281280000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 281280000 is about 16771.4042345893. The cubic root of 281280000 is about 655.2086432030.

The spelling of 281280000 in words is "two hundred eighty-one million, two hundred eighty thousand".