27891457 has 16 divisors (see below), whose sum is σ = 31230144. Its totient is φ = 24696000.

The previous prime is 27891421. The next prime is 27891463. The reversal of 27891457 is 75419872.

It is a cyclic number.

It is not a de Polignac number, because 27891457 - 2¹⁵ = 27858689 is a prime.

Its product of digits (141120) is a multiple of the sum of its prime divisors (480).

It is not an unprimeable number, because it can be changed into a prime (27891467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132082 + ... + 132292.

It is an arithmetic number, because the mean of its divisors is an integer number (1951884).

Almost surely, 2^27891457 is an apocalyptic number.

It is an amenable number.

27891457 is a deficient number, since it is larger than the sum of its proper divisors (3338687).

27891457 is a wasteful number, since it uses less digits than its factorization.

27891457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480.

The product of its digits is 141120, while the sum is 43.

The square root of 27891457 is about 5281.2363135917. The cubic root of 27891457 is about 303.2660075458.

The spelling of 27891457 in words is "twenty-seven million, eight hundred ninety-one thousand, four hundred fifty-seven".