77280197 has 2 divisors, whose sum is σ = 77280198. Its totient is φ = 77280196.

The previous prime is 77280169. The next prime is 77280199. The reversal of 77280197 is 79108277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64096036 + 13184161 = 8006^2 + 3631^2 .

It is a cyclic number.

It is not a de Polignac number, because 77280197 - 2¹⁶ = 77214661 is a prime.

Together with 77280199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77280199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38640098 + 38640099.

It is an arithmetic number, because the mean of its divisors is an integer number (38640099).

Almost surely, 2^77280197 is an apocalyptic number.

It is an amenable number.

77280197 is a deficient number, since it is larger than the sum of its proper divisors (1).

77280197 is an equidigital number, since it uses as much as digits as its factorization.

77280197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 77280197 is about 8790.9155950902. The cubic root of 77280197 is about 425.9474999038.

It can be divided in two parts, 77280 and 197, that added together give a palindrome (77477).

The spelling of 77280197 in words is "seventy-seven million, two hundred eighty thousand, one hundred ninety-seven".