78779597788 has 24 divisors (see below), whose sum is σ = 142693147520. Its totient is φ = 38016941760.

The previous prime is 78779597783. The next prime is 78779597849. The reversal of 78779597788 is 88779597787.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78779597783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 805383 + ... + 897886.

Almost surely, 2^78779597788 is an apocalyptic number.

It is an amenable number.

78779597788 is a deficient number, since it is larger than the sum of its proper divisors (63913549732).

78779597788 is a wasteful number, since it uses less digits than its factorization.

78779597788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703677 (or 1703675 counting only the distinct ones).

The product of its digits is 3485099520, while the sum is 82.

Subtracting 78779597788 from its reverse (88779597787), we obtain a palindrome (9999999999).

The spelling of 78779597788 in words is "seventy-eight billion, seven hundred seventy-nine million, five hundred ninety-seven thousand, seven hundred eighty-eight".