77776 has 10 divisors (see below), whose sum is σ = 150722. Its totient is φ = 38880.

The previous prime is 77773. The next prime is 77783. The reversal of 77776 is 67777.

It can be written as a sum of positive squares in only one way, i.e., 76176 + 1600 = 276^2 + 40^2 .

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2415 + ... + 2446.

2⁷⁷⁷⁷⁶ is an apocalyptic number.

It is an amenable number.

77776 is a deficient number, since it is larger than the sum of its proper divisors (72946).

77776 is a wasteful number, since it uses less digits than its factorization.

77776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4869 (or 4863 counting only the distinct ones).

The product of its digits is 14406, while the sum is 34.

The square root of 77776 is about 278.8834882169. The cubic root of 77776 is about 42.6856469373.

Subtracting from 77776 its reverse (67777), we obtain a palindrome (9999).

The spelling of 77776 in words is "seventy-seven thousand, seven hundred seventy-six".