77977673 has 2 divisors, whose sum is σ = 77977674. Its totient is φ = 77977672.

The previous prime is 77977639. The next prime is 77977687. The reversal of 77977673 is 37677977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43731769 + 34245904 = 6613^2 + 5852^2 .

It is an emirp because it is prime and its reverse (37677977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77977673 - 2⁶ = 77977609 is a prime.

It is not a weakly prime, because it can be changed into another prime (77977073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38988836 + 38988837.

It is an arithmetic number, because the mean of its divisors is an integer number (38988837).

Almost surely, 2^77977673 is an apocalyptic number.

It is an amenable number.

77977673 is a deficient number, since it is larger than the sum of its proper divisors (1).

77977673 is an equidigital number, since it uses as much as digits as its factorization.

77977673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2722734, while the sum is 53.

The square root of 77977673 is about 8830.4967583936. The cubic root of 77977673 is about 427.2250969074.

The spelling of 77977673 in words is "seventy-seven million, nine hundred seventy-seven thousand, six hundred seventy-three".