77686330 has 24 divisors (see below), whose sum is σ = 141777972. Its totient is φ = 30645504.

The previous prime is 77686327. The next prime is 77686333. The reversal of 77686330 is 3368677.

It is an interprime number because it is at equal distance from previous prime (77686327) and next prime (77686333).

It can be written as a sum of positive squares in 2 ways, for example, as 76965529 + 720801 = 8773^2 + 849^2 .

It is not an unprimeable number, because it can be changed into a prime (77686333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 274369 + ... + 274651.

Almost surely, 2^77686330 is an apocalyptic number.

77686330 is a deficient number, since it is larger than the sum of its proper divisors (64091642).

77686330 is an equidigital number, since it uses as much as digits as its factorization.

77686330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 77686330 is about 8813.9849103569. The cubic root of 77686330 is about 426.6923615982.

It can be divided in two parts, 77686 and 330, that multiplied together give a triangular number (25636380 = T₇₁₆₀).

The spelling of 77686330 in words is "seventy-seven million, six hundred eighty-six thousand, three hundred thirty".