27785780093 has 4 divisors (see below), whose sum is σ = 27926824860. Its totient is φ = 27644735328.

The previous prime is 27785780059. The next prime is 27785780107. The reversal of 27785780093 is 39008758772.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18160796644 + 9624983449 = 134762^2 + 98107^2 .

It is a cyclic number.

It is not a de Polignac number, because 27785780093 - 2¹⁰ = 27785779069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27785720093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70522088 + ... + 70522481.

It is an arithmetic number, because the mean of its divisors is an integer number (6981706215).

Almost surely, 2^27785780093 is an apocalyptic number.

It is an amenable number.

27785780093 is a deficient number, since it is larger than the sum of its proper divisors (141044767).

27785780093 is a wasteful number, since it uses less digits than its factorization.

27785780093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141044766.

The product of its (nonzero) digits is 5927040, while the sum is 56.

The spelling of 27785780093 in words is "twenty-seven billion, seven hundred eighty-five million, seven hundred eighty thousand, ninety-three".