281872840 has 32 divisors (see below), whose sum is σ = 643152960. Its totient is φ = 111160000.

The previous prime is 281872823. The next prime is 281872841. The reversal of 281872840 is 48278182.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 281872793 and 281872802.

It is not an unprimeable number, because it can be changed into a prime (281872841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46786 + ... + 52465.

It is an arithmetic number, because the mean of its divisors is an integer number (20098530).

Almost surely, 2^281872840 is an apocalyptic number.

281872840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281872840 is an abundant number, since it is smaller than the sum of its proper divisors (361280120).

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

281872840 is a wasteful number, since it uses less digits than its factorization.

281872840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99333 (or 99329 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 281872840 is about 16789.0690629350. The cubic root of 281872840 is about 655.6686371792.

The spelling of 281872840 in words is "two hundred eighty-one million, eight hundred seventy-two thousand, eight hundred forty".