27280231781 has 12 divisors (see below), whose sum is σ = 30050534976. Its totient is φ = 24746595720.

The previous prime is 27280231751. The next prime is 27280231793. The reversal of 27280231781 is 18713208272.

It is not a de Polignac number, because 27280231781 - 2¹⁴ = 27280215397 is a prime.

It is a super-2 number, since 2×27280231781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27280231751) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 187451 + ... + 299496.

It is an arithmetic number, because the mean of its divisors is an integer number (2504211248).

Almost surely, 2^27280231781 is an apocalyptic number.

It is an amenable number.

27280231781 is a deficient number, since it is larger than the sum of its proper divisors (2770303195).

27280231781 is a wasteful number, since it uses less digits than its factorization.

27280231781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487432 (or 487421 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 41.

The spelling of 27280231781 in words is "twenty-seven billion, two hundred eighty million, two hundred thirty-one thousand, seven hundred eighty-one".