27828557 has 4 divisors (see below), whose sum is σ = 27883740. Its totient is φ = 27773376.

The previous prime is 27828547. The next prime is 27828583. The reversal of 27828557 is 75582872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12859396 + 14969161 = 3586^2 + 3869^2 .

It is a cyclic number.

It is not a de Polignac number, because 27828557 - 2⁸ = 27828301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27828547) 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 3 ways as a sum of consecutive naturals, for example, 26828 + ... + 27845.

It is an arithmetic number, because the mean of its divisors is an integer number (6970935).

Almost surely, 2^27828557 is an apocalyptic number.

It is an amenable number.

27828557 is a deficient number, since it is larger than the sum of its proper divisors (55183).

27828557 is an equidigital number, since it uses as much as digits as its factorization.

27828557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55182.

The product of its digits is 313600, while the sum is 44.

The square root of 27828557 is about 5275.2779073713. The cubic root of 27828557 is about 303.0378637416.

The spelling of 27828557 in words is "twenty-seven million, eight hundred twenty-eight thousand, five hundred fifty-seven".