77686848 has 42 divisors (see below), whose sum is σ = 222676974. Its totient is φ = 25895424.

The previous prime is 77686813. The next prime is 77686849. The reversal of 77686848 is 84868677.

It can be written as a sum of positive squares in only one way, i.e., 63489024 + 14197824 = 7968^2 + 3768^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77686794 and 77686803.

It is not an unprimeable number, because it can be changed into a prime (77686849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66861 + ... + 68012.

Almost surely, 2^77686848 is an apocalyptic number.

It is an amenable number.

77686848 is an abundant number, since it is smaller than the sum of its proper divisors (144990126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77686848 is a wasteful number, since it uses less digits than its factorization.

77686848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134891 (or 134878 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The square root of 77686848 is about 8814.0142954275. The cubic root of 77686848 is about 426.6933099682.

The spelling of 77686848 in words is "seventy-seven million, six hundred eighty-six thousand, eight hundred forty-eight".