27780502781 has 8 divisors (see below), whose sum is σ = 29923459584. Its totient is φ = 25715471760.

The previous prime is 27780502753. The next prime is 27780502787. The reversal of 27780502781 is 18720508772.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27780502781 - 2¹⁰ = 27780501757 is a prime.

It is a super-2 number, since 2×27780502781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27780502787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19480706 + ... + 19482131.

It is an arithmetic number, because the mean of its divisors is an integer number (3740432448).

Almost surely, 2^27780502781 is an apocalyptic number.

It is an amenable number.

27780502781 is a deficient number, since it is larger than the sum of its proper divisors (2142956803).

27780502781 is a wasteful number, since it uses less digits than its factorization.

27780502781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38962891.

The product of its (nonzero) digits is 439040, while the sum is 47.

The spelling of 27780502781 in words is "twenty-seven billion, seven hundred eighty million, five hundred two thousand, seven hundred eighty-one".