77769397 has 2 divisors, whose sum is σ = 77769398. Its totient is φ = 77769396.

The previous prime is 77769383. The next prime is 77769401. The reversal of 77769397 is 79396777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75881521 + 1887876 = 8711^2 + 1374^2 .

It is an emirp because it is prime and its reverse (79396777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77769397 - 2¹⁵ = 77736629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77763397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38884698 + 38884699.

It is an arithmetic number, because the mean of its divisors is an integer number (38884699).

Almost surely, 2^77769397 is an apocalyptic number.

It is an amenable number.

77769397 is a deficient number, since it is larger than the sum of its proper divisors (1).

77769397 is an equidigital number, since it uses as much as digits as its factorization.

77769397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3500658, while the sum is 55.

The square root of 77769397 is about 8818.6958786433. The cubic root of 77769397 is about 426.8443893269.

The spelling of 77769397 in words is "seventy-seven million, seven hundred sixty-nine thousand, three hundred ninety-seven".