77906684 has 12 divisors (see below), whose sum is σ = 137869200. Its totient is φ = 38515488.

The previous prime is 77906677. The next prime is 77906687. The reversal of 77906684 is 48660977.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77906687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109064 + ... + 109775.

It is an arithmetic number, because the mean of its divisors is an integer number (11489100).

Almost surely, 2^77906684 is an apocalyptic number.

It is an amenable number.

77906684 is a deficient number, since it is larger than the sum of its proper divisors (59962516).

77906684 is a wasteful number, since it uses less digits than its factorization.

77906684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218932 (or 218930 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 77906684 is about 8826.4763071115. The cubic root of 77906684 is about 427.0954123910.

The spelling of 77906684 in words is "seventy-seven million, nine hundred six thousand, six hundred eighty-four".