77730773 has 2 divisors, whose sum is σ = 77730774. Its totient is φ = 77730772.

The previous prime is 77730769. The next prime is 77730791. The reversal of 77730773 is 37703777.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67535524 + 10195249 = 8218^2 + 3193^2 .

It is a cyclic number.

It is not a de Polignac number, because 77730773 - 2² = 77730769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77730773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77730703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38865386 + 38865387.

It is an arithmetic number, because the mean of its divisors is an integer number (38865387).

Almost surely, 2^77730773 is an apocalyptic number.

It is an amenable number.

77730773 is a deficient number, since it is larger than the sum of its proper divisors (1).

77730773 is an equidigital number, since it uses as much as digits as its factorization.

77730773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151263, while the sum is 41.

The square root of 77730773 is about 8816.5057137167. The cubic root of 77730773 is about 426.7737138496.

The spelling of 77730773 in words is "seventy-seven million, seven hundred thirty thousand, seven hundred seventy-three".