27800747657 has 8 divisors (see below), whose sum is σ = 29014687296. Its totient is φ = 26587242352.

The previous prime is 27800747647. The next prime is 27800747699. The reversal of 27800747657 is 75674700872.

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 27800747657 - 2¹² = 27800743561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27800747599 and 27800747608.

It is not an unprimeable number, because it can be changed into a prime (27800747647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25778 + ... + 237204.

It is an arithmetic number, because the mean of its divisors is an integer number (3626835912).

Almost surely, 2^27800747657 is an apocalyptic number.

It is an amenable number.

27800747657 is a deficient number, since it is larger than the sum of its proper divisors (1213939639).

27800747657 is a wasteful number, since it uses less digits than its factorization.

27800747657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217167.

The product of its (nonzero) digits is 4609920, while the sum is 53.

The spelling of 27800747657 in words is "twenty-seven billion, eight hundred million, seven hundred forty-seven thousand, six hundred fifty-seven".