281220340 has 12 divisors (see below), whose sum is σ = 590562756. Its totient is φ = 112488128.

The previous prime is 281220319. The next prime is 281220347. The reversal of 281220340 is 43022182.

It can be written as a sum of positive squares in 2 ways, for example, as 28601104 + 252619236 = 5348^2 + 15894^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281220347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7030489 + ... + 7030528.

It is an arithmetic number, because the mean of its divisors is an integer number (49213563).

Almost surely, 2^281220340 is an apocalyptic number.

281220340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281220340 is an abundant number, since it is smaller than the sum of its proper divisors (309342416).

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

281220340 is a wasteful number, since it uses less digits than its factorization.

281220340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14061026 (or 14061024 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 281220340 is about 16769.6255175839. The cubic root of 281220340 is about 655.1623162789.

The spelling of 281220340 in words is "two hundred eighty-one million, two hundred twenty thousand, three hundred forty".