27800560660 has 24 divisors (see below), whose sum is σ = 58428425160. Its totient is φ = 11111224704.

The previous prime is 27800560643. The next prime is 27800560661. The reversal of 27800560660 is 6606500872.

It can be written as a sum of positive squares in 4 ways, for example, as 10982620804 + 16817939856 = 104798^2 + 129684^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27800560661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537115 + ... + 586594.

It is an arithmetic number, because the mean of its divisors is an integer number (2434517715).

Almost surely, 2^27800560660 is an apocalyptic number.

27800560660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27800560660 is an abundant number, since it is smaller than the sum of its proper divisors (30627864500).

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

27800560660 is a wasteful number, since it uses less digits than its factorization.

27800560660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124955 (or 1124953 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 27800560660 in words is "twenty-seven billion, eight hundred million, five hundred sixty thousand, six hundred sixty".