77563693 has 2 divisors, whose sum is σ = 77563694. Its totient is φ = 77563692.

The previous prime is 77563691. The next prime is 77563699. The reversal of 77563693 is 39636577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38900169 + 38663524 = 6237^2 + 6218^2 .

It is an emirp because it is prime and its reverse (39636577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77563693 - 2¹ = 77563691 is a prime.

It is a super-2 number, since 2×77563693² = 12032252943596498, which contains 22 as substring.

Together with 77563691, 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 (77563691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38781846 + 38781847.

It is an arithmetic number, because the mean of its divisors is an integer number (38781847).

Almost surely, 2^77563693 is an apocalyptic number.

It is an amenable number.

77563693 is a deficient number, since it is larger than the sum of its proper divisors (1).

77563693 is an equidigital number, since it uses as much as digits as its factorization.

77563693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 46.

The square root of 77563693 is about 8807.0252071855. The cubic root of 77563693 is about 426.4677153369.

It can be divided in two parts, 7756 and 3693, that added together give a square (11449 = 107²).

The spelling of 77563693 in words is "seventy-seven million, five hundred sixty-three thousand, six hundred ninety-three".