77497769 has 2 divisors, whose sum is σ = 77497770. Its totient is φ = 77497768.

The previous prime is 77497757. The next prime is 77497811. The reversal of 77497769 is 96779477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74304400 + 3193369 = 8620^2 + 1787^2 .

It is an emirp because it is prime and its reverse (96779477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77497769 - 2⁴ = 77497753 is a prime.

It is a super-2 number, since 2×77497769² = 12011808399954722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77497669) 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, 38748884 + 38748885.

It is an arithmetic number, because the mean of its divisors is an integer number (38748885).

Almost surely, 2^77497769 is an apocalyptic number.

It is an amenable number.

77497769 is a deficient number, since it is larger than the sum of its proper divisors (1).

77497769 is an equidigital number, since it uses as much as digits as its factorization.

77497769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4667544, while the sum is 56.

The square root of 77497769 is about 8803.2817176324. The cubic root of 77497769 is about 426.3468579895.

The spelling of 77497769 in words is "seventy-seven million, four hundred ninety-seven thousand, seven hundred sixty-nine".