78797798 has 4 divisors (see below), whose sum is σ = 118196700. Its totient is φ = 39398898.

The previous prime is 78797783. The next prime is 78797809. The reversal of 78797798 is 89779787.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78797798.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19699448 + ... + 19699451.

It is an arithmetic number, because the mean of its divisors is an integer number (29549175).

Almost surely, 2^78797798 is an apocalyptic number.

78797798 is a deficient number, since it is larger than the sum of its proper divisors (39398902).

78797798 is a wasteful number, since it uses less digits than its factorization.

78797798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39398901.

The product of its digits is 12446784, while the sum is 62.

The square root of 78797798 is about 8876.8123783259. The cubic root of 78797798 is about 428.7176470075.

It can be divided in two parts, 7879779 and 8, that added together give a palindrome (7879787).

The spelling of 78797798 in words is "seventy-eight million, seven hundred ninety-seven thousand, seven hundred ninety-eight".