281009240 has 64 divisors (see below), whose sum is σ = 679795200. Its totient is φ = 104208768.

The previous prime is 281009177. The next prime is 281009243. The reversal of 281009240 is 42900182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281009243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31787 + ... + 39653.

It is an arithmetic number, because the mean of its divisors is an integer number (10621800).

Almost surely, 2^281009240 is an apocalyptic number.

281009240 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 281009240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339897600).

281009240 is an abundant number, since it is smaller than the sum of its proper divisors (398785960).

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

281009240 is a wasteful number, since it uses less digits than its factorization.

281009240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7944 (or 7940 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 281009240 is about 16763.3302180682. The cubic root of 281009240 is about 654.9983411958.

The spelling of 281009240 in words is "two hundred eighty-one million, nine thousand, two hundred forty".