281768277940 has 12 divisors (see below), whose sum is σ = 591713383716. Its totient is φ = 112707311168.

The previous prime is 281768277887. The next prime is 281768277991. The reversal of 281768277940 is 49772867182.

It can be written as a sum of positive squares in 2 ways, for example, as 196109036964 + 85659240976 = 442842^2 + 292676^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7044206929 + ... + 7044206968.

It is an arithmetic number, because the mean of its divisors is an integer number (49309448643).

Almost surely, 2^281768277940 is an apocalyptic number.

281768277940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281768277940 is an abundant number, since it is smaller than the sum of its proper divisors (309945105776).

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

281768277940 is a wasteful number, since it uses less digits than its factorization.

281768277940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14088413906 (or 14088413904 counting only the distinct ones).

The product of its (nonzero) digits is 18966528, while the sum is 61.

The spelling of 281768277940 in words is "two hundred eighty-one billion, seven hundred sixty-eight million, two hundred seventy-seven thousand, nine hundred forty".