77228197 has 2 divisors, whose sum is σ = 77228198. Its totient is φ = 77228196.

The previous prime is 77228171. The next prime is 77228201. The reversal of 77228197 is 79182277.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57744801 + 19483396 = 7599^2 + 4414^2 .

It is a cyclic number.

It is not a de Polignac number, because 77228197 - 2⁷ = 77228069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77228117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38614098 + 38614099.

It is an arithmetic number, because the mean of its divisors is an integer number (38614099).

Almost surely, 2^77228197 is an apocalyptic number.

It is an amenable number.

77228197 is a deficient number, since it is larger than the sum of its proper divisors (1).

77228197 is an equidigital number, since it uses as much as digits as its factorization.

77228197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 43.

The square root of 77228197 is about 8787.9574987593. The cubic root of 77228197 is about 425.8519418324.

The spelling of 77228197 in words is "seventy-seven million, two hundred twenty-eight thousand, one hundred ninety-seven".