77665716 has 36 divisors (see below), whose sum is σ = 203595392. Its totient is φ = 25888248.

The previous prime is 77665703. The next prime is 77665717. The reversal of 77665716 is 61756677.

77665716 is a `hidden beast` number, since 7 + 76 + 6 + 571 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77665717) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 38980 + ... + 40923.

Almost surely, 2^77665716 is an apocalyptic number.

It is an amenable number.

77665716 is an abundant number, since it is smaller than the sum of its proper divisors (125929676).

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

77665716 is a wasteful number, since it uses less digits than its factorization.

77665716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79922 (or 79908 counting only the distinct ones).

The product of its digits is 370440, while the sum is 45.

The square root of 77665716 is about 8812.8154411629. The cubic root of 77665716 is about 426.6546174440.

The spelling of 77665716 in words is "seventy-seven million, six hundred sixty-five thousand, seven hundred sixteen".