77897468668 has 24 divisors (see below), whose sum is σ = 143505084800. Its totient is φ = 36896294448.

The previous prime is 77897468617. The next prime is 77897468707. The reversal of 77897468668 is 86686479877.

It is a Harshad number since it is a multiple of its sum of digits (76).

It is a junction number, because it is equal to n+sod(n) for n = 77897468594 and 77897468603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1582321 + ... + 1630807.

Almost surely, 2^77897468668 is an apocalyptic number.

It is an amenable number.

77897468668 is a deficient number, since it is larger than the sum of its proper divisors (65607616132).

77897468668 is a wasteful number, since it uses less digits than its factorization.

77897468668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69649 (or 69647 counting only the distinct ones).

The product of its digits is 1365590016, while the sum is 76.

The spelling of 77897468668 in words is "seventy-seven billion, eight hundred ninety-seven million, four hundred sixty-eight thousand, six hundred sixty-eight".