27990338257 has 24 divisors (see below), whose sum is σ = 34130128032. Its totient is φ = 22862145600.

The previous prime is 27990338239. The next prime is 27990338263. The reversal of 27990338257 is 75283309972.

It is not a de Polignac number, because 27990338257 - 2²⁷ = 27856120529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27990338198 and 27990338207.

It is not an unprimeable number, because it can be changed into a prime (27990338657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75619 + ... + 248392.

It is an arithmetic number, because the mean of its divisors is an integer number (1422088668).

Almost surely, 2^27990338257 is an apocalyptic number.

It is an amenable number.

27990338257 is a deficient number, since it is larger than the sum of its proper divisors (6139789775).

27990338257 is a wasteful number, since it uses less digits than its factorization.

27990338257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324109 (or 324102 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 55.

The spelling of 27990338257 in words is "twenty-seven billion, nine hundred ninety million, three hundred thirty-eight thousand, two hundred fifty-seven".