27800655909 has 32 divisors (see below), whose sum is σ = 40194155904. Its totient is φ = 16990352640.

The previous prime is 27800655871. The next prime is 27800655947. The reversal of 27800655909 is 90955600872.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (27800655871) and next prime (27800655947).

It is not a de Polignac number, because 27800655909 - 2¹⁷ = 27800524837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27800655989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8344374 + ... + 8347704.

It is an arithmetic number, because the mean of its divisors is an integer number (1256067372).

Almost surely, 2^27800655909 is an apocalyptic number.

It is an amenable number.

27800655909 is a deficient number, since it is larger than the sum of its proper divisors (12393499995).

27800655909 is a wasteful number, since it uses less digits than its factorization.

27800655909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4757.

The product of its (nonzero) digits is 1360800, while the sum is 51.

The spelling of 27800655909 in words is "twenty-seven billion, eight hundred million, six hundred fifty-five thousand, nine hundred nine".