77731707764 has 96 divisors (see below), whose sum is σ = 153154713600. Its totient is φ = 34374574080.

The previous prime is 77731707761. The next prime is 77731707821. The reversal of 77731707764 is 46770713777.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77731707761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8017832 + ... + 8027520.

It is an arithmetic number, because the mean of its divisors is an integer number (1595361600).

Almost surely, 2^77731707764 is an apocalyptic number.

It is an amenable number.

77731707764 is a deficient number, since it is larger than the sum of its proper divisors (75423005836).

77731707764 is a wasteful number, since it uses less digits than its factorization.

77731707764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9873 (or 9871 counting only the distinct ones).

The product of its (nonzero) digits is 8470728, while the sum is 56.

The spelling of 77731707764 in words is "seventy-seven billion, seven hundred thirty-one million, seven hundred seven thousand, seven hundred sixty-four".