77830069 has 2 divisors, whose sum is σ = 77830070. Its totient is φ = 77830068.

The previous prime is 77830037. The next prime is 77830079. The reversal of 77830069 is 96003877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69639025 + 8191044 = 8345^2 + 2862^2 .

It is an emirp because it is prime and its reverse (96003877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77830069 - 2⁵ = 77830037 is a prime.

It is a super-2 number, since 2×77830069² = 12115039281089522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77830009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38915034 + 38915035.

It is an arithmetic number, because the mean of its divisors is an integer number (38915035).

Almost surely, 2^77830069 is an apocalyptic number.

It is an amenable number.

77830069 is a deficient number, since it is larger than the sum of its proper divisors (1).

77830069 is an equidigital number, since it uses as much as digits as its factorization.

77830069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 77830069 is about 8822.1351723945. The cubic root of 77830069 is about 426.9553617318.

The spelling of 77830069 in words is "seventy-seven million, eight hundred thirty thousand, sixty-nine".