77706680 has 32 divisors (see below), whose sum is σ = 177711840. Its totient is φ = 30572160.

The previous prime is 77706653. The next prime is 77706683. The reversal of 77706680 is 8660777.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77706683) 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 7 ways as a sum of consecutive naturals, for example, 13484 + ... + 18363.

It is an arithmetic number, because the mean of its divisors is an integer number (5553495).

Almost surely, 2^77706680 is an apocalyptic number.

It is an amenable number.

77706680 is an abundant number, since it is smaller than the sum of its proper divisors (100005160).

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

77706680 is a wasteful number, since it uses less digits than its factorization.

77706680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31919 (or 31915 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 41.

The square root of 77706680 is about 8815.1392501764. The cubic root of 77706680 is about 426.7296158207.

The spelling of 77706680 in words is "seventy-seven million, seven hundred six thousand, six hundred eighty".