77825369 has 2 divisors, whose sum is σ = 77825370. Its totient is φ = 77825368.

The previous prime is 77825351. The next prime is 77825389. The reversal of 77825369 is 96352877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77352025 + 473344 = 8795^2 + 688^2 .

It is a cyclic number.

It is not a de Polignac number, because 77825369 - 2¹² = 77821273 is a prime.

It is a super-2 number, since 2×77825369² = 12113576119972322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (77825309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38912684 + 38912685.

It is an arithmetic number, because the mean of its divisors is an integer number (38912685).

Almost surely, 2^77825369 is an apocalyptic number.

It is an amenable number.

77825369 is a deficient number, since it is larger than the sum of its proper divisors (1).

77825369 is an equidigital number, since it uses as much as digits as its factorization.

77825369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The square root of 77825369 is about 8821.8687929486. The cubic root of 77825369 is about 426.9467672361.

The spelling of 77825369 in words is "seventy-seven million, eight hundred twenty-five thousand, three hundred sixty-nine".