27928513 has 2 divisors, whose sum is σ = 27928514. Its totient is φ = 27928512.

The previous prime is 27928477. The next prime is 27928517. The reversal of 27928513 is 31582972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26863489 + 1065024 = 5183^2 + 1032^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27928513 is a prime.

It is not a weakly prime, because it can be changed into another prime (27928517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13964256 + 13964257.

It is an arithmetic number, because the mean of its divisors is an integer number (13964257).

Almost surely, 2^27928513 is an apocalyptic number.

It is an amenable number.

27928513 is a deficient number, since it is larger than the sum of its proper divisors (1).

27928513 is an equidigital number, since it uses as much as digits as its factorization.

27928513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 27928513 is about 5284.7434185587. The cubic root of 27928513 is about 303.4002523801.

It can be divided in two parts, 27928 and 513, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 27928513 in words is "twenty-seven million, nine hundred twenty-eight thousand, five hundred thirteen".