77691765 has 16 divisors (see below), whose sum is σ = 125133696. Its totient is φ = 41160000.

The previous prime is 77691763. The next prime is 77691787. The reversal of 77691765 is 56719677.

It is a happy number.

It is not a de Polignac number, because 77691765 - 2¹ = 77691763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77691763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14886 + ... + 19415.

It is an arithmetic number, because the mean of its divisors is an integer number (7820856).

Almost surely, 2^77691765 is an apocalyptic number.

It is an amenable number.

77691765 is a deficient number, since it is larger than the sum of its proper divisors (47441931).

77691765 is a wasteful number, since it uses less digits than its factorization.

77691765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34460.

The product of its digits is 555660, while the sum is 48.

The square root of 77691765 is about 8814.2932218074. The cubic root of 77691765 is about 426.7023119498.

The spelling of 77691765 in words is "seventy-seven million, six hundred ninety-one thousand, seven hundred sixty-five".