27819797 has 2 divisors, whose sum is σ = 27819798. Its totient is φ = 27819796.

The previous prime is 27819793. The next prime is 27819821. The reversal of 27819797 is 79791872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16048036 + 11771761 = 4006^2 + 3431^2 .

It is a cyclic number.

It is not a de Polignac number, because 27819797 - 2² = 27819793 is a prime.

It is a super-2 number, since 2×27819797² = 1547882210242418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27819791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13909898 + 13909899.

It is an arithmetic number, because the mean of its divisors is an integer number (13909899).

Almost surely, 2^27819797 is an apocalyptic number.

It is an amenable number.

27819797 is a deficient number, since it is larger than the sum of its proper divisors (1).

27819797 is an equidigital number, since it uses as much as digits as its factorization.

27819797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 50.

The square root of 27819797 is about 5274.4475540098. The cubic root of 27819797 is about 303.0060631913.

The spelling of 27819797 in words is "twenty-seven million, eight hundred nineteen thousand, seven hundred ninety-seven".