77477689 has 2 divisors, whose sum is σ = 77477690. Its totient is φ = 77477688.

The previous prime is 77477681. The next prime is 77477693. The reversal of 77477689 is 98677477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72812089 + 4665600 = 8533^2 + 2160^2 .

It is an emirp because it is prime and its reverse (98677477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77477689 - 2³ = 77477681 is a prime.

It is not a weakly prime, because it can be changed into another prime (77477681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38738844 + 38738845.

It is an arithmetic number, because the mean of its divisors is an integer number (38738845).

Almost surely, 2^77477689 is an apocalyptic number.

It is an amenable number.

77477689 is a deficient number, since it is larger than the sum of its proper divisors (1).

77477689 is an equidigital number, since it uses as much as digits as its factorization.

77477689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4148928, while the sum is 55.

The square root of 77477689 is about 8802.1411599678. The cubic root of 77477689 is about 426.3100320502.

The spelling of 77477689 in words is "seventy-seven million, four hundred seventy-seven thousand, six hundred eighty-nine".