27928657 has 2 divisors, whose sum is σ = 27928658. Its totient is φ = 27928656.

The previous prime is 27928643. The next prime is 27928679. The reversal of 27928657 is 75682972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26122321 + 1806336 = 5111^2 + 1344^2 .

It is a cyclic number.

It is not a de Polignac number, because 27928657 - 2⁷ = 27928529 is a prime.

It is not a weakly prime, because it can be changed into another prime (27928687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13964328 + 13964329.

It is an arithmetic number, because the mean of its divisors is an integer number (13964329).

Almost surely, 2^27928657 is an apocalyptic number.

It is an amenable number.

27928657 is a deficient number, since it is larger than the sum of its proper divisors (1).

27928657 is an equidigital number, since it uses as much as digits as its factorization.

27928657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 46.

The square root of 27928657 is about 5284.7570426653. The cubic root of 27928657 is about 303.4007738252.

It can be divided in two parts, 2792 and 8657, that added together give a square (11449 = 107²).

The spelling of 27928657 in words is "twenty-seven million, nine hundred twenty-eight thousand, six hundred fifty-seven".