77308669 has 2 divisors, whose sum is σ = 77308670. Its totient is φ = 77308668.

The previous prime is 77308667. The next prime is 77308697. The reversal of 77308669 is 96680377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73736569 + 3572100 = 8587^2 + 1890^2 .

It is a cyclic number.

It is not a de Polignac number, because 77308669 - 2¹ = 77308667 is a prime.

It is a super-2 number, since 2×77308669² = 11953260605103122, which contains 22 as substring.

Together with 77308667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77308667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38654334 + 38654335.

It is an arithmetic number, because the mean of its divisors is an integer number (38654335).

Almost surely, 2^77308669 is an apocalyptic number.

It is an amenable number.

77308669 is a deficient number, since it is larger than the sum of its proper divisors (1).

77308669 is an equidigital number, since it uses as much as digits as its factorization.

77308669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 77308669 is about 8792.5348449693. The cubic root of 77308669 is about 425.9998034634. Note that the first 3 decimals are identical.

It can be divided in two parts, 77308 and 669, that added together give a palindrome (77977).

The spelling of 77308669 in words is "seventy-seven million, three hundred eight thousand, six hundred sixty-nine".