78821242568 has 64 divisors (see below), whose sum is σ = 155780651520. Its totient is φ = 37336665600.

The previous prime is 78821242553. The next prime is 78821242613. The reversal of 78821242568 is 86524212887.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6131828 + ... + 6144668.

It is an arithmetic number, because the mean of its divisors is an integer number (2434072680).

Almost surely, 2^78821242568 is an apocalyptic number.

It is an amenable number.

78821242568 is a deficient number, since it is larger than the sum of its proper divisors (76959408952).

78821242568 is a wasteful number, since it uses less digits than its factorization.

78821242568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13398 (or 13394 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 53.

The spelling of 78821242568 in words is "seventy-eight billion, eight hundred twenty-one million, two hundred forty-two thousand, five hundred sixty-eight".