77749369 has 2 divisors, whose sum is σ = 77749370. Its totient is φ = 77749368.

The previous prime is 77749297. The next prime is 77749379. The reversal of 77749369 is 96394777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77088400 + 660969 = 8780^2 + 813^2 .

It is a cyclic number.

It is not a de Polignac number, because 77749369 - 2¹³ = 77741177 is a prime.

It is a super-2 number, since 2×77749369² = 12089928759796322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77749379) 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, 38874684 + 38874685.

It is an arithmetic number, because the mean of its divisors is an integer number (38874685).

Almost surely, 2^77749369 is an apocalyptic number.

It is an amenable number.

77749369 is a deficient number, since it is larger than the sum of its proper divisors (1).

77749369 is an equidigital number, since it uses as much as digits as its factorization.

77749369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2000376, while the sum is 52.

The square root of 77749369 is about 8817.5602634742. The cubic root of 77749369 is about 426.8077443495.

The spelling of 77749369 in words is "seventy-seven million, seven hundred forty-nine thousand, three hundred sixty-nine".