77686988 has 12 divisors (see below), whose sum is σ = 136483032. Its totient is φ = 38691840.

The previous prime is 77686979. The next prime is 77687003. The reversal of 77686988 is 88968677.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36758 + ... + 38813.

It is an arithmetic number, because the mean of its divisors is an integer number (11373586).

Almost surely, 2^77686988 is an apocalyptic number.

It is an amenable number.

77686988 is a deficient number, since it is larger than the sum of its proper divisors (58796044).

77686988 is a wasteful number, since it uses less digits than its factorization.

77686988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75832 (or 75830 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 59.

The square root of 77686988 is about 8814.0222373216. The cubic root of 77686988 is about 426.6935662837.

The spelling of 77686988 in words is "seventy-seven million, six hundred eighty-six thousand, nine hundred eighty-eight".