27728797 has 2 divisors, whose sum is σ = 27728798. Its totient is φ = 27728796.

The previous prime is 27728773. The next prime is 27728803. The reversal of 27728797 is 79782772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24265476 + 3463321 = 4926^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 27728797 - 2¹¹ = 27726749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27728797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27728707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13864398 + 13864399.

It is an arithmetic number, because the mean of its divisors is an integer number (13864399).

Almost surely, 2^27728797 is an apocalyptic number.

It is an amenable number.

27728797 is a deficient number, since it is larger than the sum of its proper divisors (1).

27728797 is an equidigital number, since it uses as much as digits as its factorization.

27728797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691488, while the sum is 49.

The square root of 27728797 is about 5265.8139921573. The cubic root of 27728797 is about 302.6753194485.

The spelling of 27728797 in words is "twenty-seven million, seven hundred twenty-eight thousand, seven hundred ninety-seven".