77777677 has 4 divisors (see below), whose sum is σ = 77831676. Its totient is φ = 77723680.

The previous prime is 77777653. The next prime is 77777699. The reversal of 77777677 is 77677777.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33767721 + 44009956 = 5811^2 + 6634^2 .

It is a cyclic number.

It is not a de Polignac number, because 77777677 - 2²³ = 69389069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77777617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24778 + ... + 27739.

It is an arithmetic number, because the mean of its divisors is an integer number (19457919).

Almost surely, 2^77777677 is an apocalyptic number.

It is an amenable number.

77777677 is a deficient number, since it is larger than the sum of its proper divisors (53999).

77777677 is a wasteful number, since it uses less digits than its factorization.

77777677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53998.

The product of its digits is 4941258, while the sum is 55.

The square root of 77777677 is about 8819.1653233172. The cubic root of 77777677 is about 426.8595372997.

The spelling of 77777677 in words is "seventy-seven million, seven hundred seventy-seven thousand, six hundred seventy-seven".