281783780640 has 192 divisors, whose sum is σ = 1002412091520. Its totient is φ = 73910430720.

The previous prime is 281783780627. The next prime is 281783780651. The reversal of 281783780640 is 46087387182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 271134 + ... + 798173.

It is an arithmetic number, because the mean of its divisors is an integer number (5220896310).

Almost surely, 2^281783780640 is an apocalyptic number.

281783780640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281783780640 is an abundant number, since it is smaller than the sum of its proper divisors (720628310880).

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

281783780640 is a wasteful number, since it uses less digits than its factorization.

281783780640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069392 (or 1069378 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The spelling of 281783780640 in words is "two hundred eighty-one billion, seven hundred eighty-three million, seven hundred eighty thousand, six hundred forty".