281087040 has 224 divisors, whose sum is σ = 974969856. Its totient is φ = 68198400.

The previous prime is 281087029. The next prime is 281087047. The reversal of 281087040 is 40780182.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 281086989 and 281087007.

It is not an unprimeable number, because it can be changed into a prime (281087047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1260369 + ... + 1260591.

It is an arithmetic number, because the mean of its divisors is an integer number (4352544).

Almost surely, 2^281087040 is an apocalyptic number.

281087040 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 281087040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (487484928).

281087040 is an abundant number, since it is smaller than the sum of its proper divisors (693882816).

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

281087040 is a wasteful number, since it uses less digits than its factorization.

281087040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 281087040 is about 16765.6505987689. The cubic root of 281087040 is about 655.0587830622.

The spelling of 281087040 in words is "two hundred eighty-one million, eighty-seven thousand, forty".