281535868140 has 48 divisors (see below), whose sum is σ = 834671047392. Its totient is φ = 70659982336.

The previous prime is 281535868127. The next prime is 281535868291. The reversal of 281535868140 is 41868535182.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138006759 + ... + 138008798.

It is an arithmetic number, because the mean of its divisors is an integer number (17388980154).

Almost surely, 2^281535868140 is an apocalyptic number.

281535868140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281535868140 is an abundant number, since it is smaller than the sum of its proper divisors (553135179252).

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

281535868140 is a wasteful number, since it uses less digits than its factorization.

281535868140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276015586 (or 276015584 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 51.

The spelling of 281535868140 in words is "two hundred eighty-one billion, five hundred thirty-five million, eight hundred sixty-eight thousand, one hundred forty".