77777977 has 8 divisors (see below), whose sum is σ = 81803520. Its totient is φ = 73847280.

The previous prime is 77777929. The next prime is 77778011. The reversal of 77777977 is 77977777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77777977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77777177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22027 + ... + 25312.

It is an arithmetic number, because the mean of its divisors is an integer number (10225440).

Almost surely, 2^77777977 is an apocalyptic number.

It is an amenable number.

77777977 is a deficient number, since it is larger than the sum of its proper divisors (4025543).

77777977 is a wasteful number, since it uses less digits than its factorization.

77777977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47423.

The product of its digits is 7411887, while the sum is 58.

The square root of 77777977 is about 8819.1823317131. The cubic root of 77777977 is about 426.8600861191.

The spelling of 77777977 in words is "seventy-seven million, seven hundred seventy-seven thousand, nine hundred seventy-seven".