77897729 has 16 divisors (see below), whose sum is σ = 96526080. Its totient is φ = 61214400.

The previous prime is 77897717. The next prime is 77897737. The reversal of 77897729 is 92779877.

It is not a de Polignac number, because 77897729 - 2¹² = 77893633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77897749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10907 + ... + 16575.

It is an arithmetic number, because the mean of its divisors is an integer number (6032880).

Almost surely, 2^77897729 is an apocalyptic number.

It is an amenable number.

77897729 is a deficient number, since it is larger than the sum of its proper divisors (18628351).

77897729 is a wasteful number, since it uses less digits than its factorization.

77897729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5840.

The product of its digits is 3111696, while the sum is 56.

The square root of 77897729 is about 8825.9690119556. The cubic root of 77897729 is about 427.0790475736.

The spelling of 77897729 in words is "seventy-seven million, eight hundred ninety-seven thousand, seven hundred twenty-nine".