77868728997 has 16 divisors (see below), whose sum is σ = 104529266688. Its totient is φ = 51560449200.

The previous prime is 77868728969. The next prime is 77868729019. The reversal of 77868728997 is 79982786877.

It is not a de Polignac number, because 77868728997 - 2¹⁶ = 77868663461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77868728297) 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, 4350288 + ... + 4368150.

It is an arithmetic number, because the mean of its divisors is an integer number (6533079168).

Almost surely, 2^77868728997 is an apocalyptic number.

It is an amenable number.

77868728997 is a deficient number, since it is larger than the sum of its proper divisors (26660537691).

77868728997 is a wasteful number, since it uses less digits than its factorization.

77868728997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27640.

The product of its digits is 1194891264, while the sum is 78.

The spelling of 77868728997 in words is "seventy-seven billion, eight hundred sixty-eight million, seven hundred twenty-eight thousand, nine hundred ninety-seven".