77932769 has 2 divisors, whose sum is σ = 77932770. Its totient is φ = 77932768.

The previous prime is 77932741. The next prime is 77932781. The reversal of 77932769 is 96723977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75916369 + 2016400 = 8713^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 77932769 - 2²⁴ = 61155553 is a prime.

It is a super-2 number, since 2×77932769² = 12147032968014722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77938769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38966384 + 38966385.

It is an arithmetic number, because the mean of its divisors is an integer number (38966385).

Almost surely, 2^77932769 is an apocalyptic number.

It is an amenable number.

77932769 is a deficient number, since it is larger than the sum of its proper divisors (1).

77932769 is an equidigital number, since it uses as much as digits as its factorization.

77932769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1000188, while the sum is 50.

The square root of 77932769 is about 8827.9538399337. The cubic root of 77932769 is about 427.1430742864.

The spelling of 77932769 in words is "seventy-seven million, nine hundred thirty-two thousand, seven hundred sixty-nine".