27720670457 has 4 divisors (see below), whose sum is σ = 27842788176. Its totient is φ = 27598552740.

The previous prime is 27720670451. The next prime is 27720670459. The reversal of 27720670457 is 75407602772.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27720670457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27720670451) 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, 61058519 + ... + 61058972.

It is an arithmetic number, because the mean of its divisors is an integer number (6960697044).

Almost surely, 2^27720670457 is an apocalyptic number.

It is an amenable number.

27720670457 is a deficient number, since it is larger than the sum of its proper divisors (122117719).

27720670457 is a wasteful number, since it uses less digits than its factorization.

27720670457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122117718.

The product of its (nonzero) digits is 1152480, while the sum is 47.

The spelling of 27720670457 in words is "twenty-seven billion, seven hundred twenty million, six hundred seventy thousand, four hundred fifty-seven".