78518658628 has 6 divisors (see below), whose sum is σ = 137407652606. Its totient is φ = 39259329312.

The previous prime is 78518658623. The next prime is 78518658643. The reversal of 78518658628 is 82685681587.

It can be written as a sum of positive squares in only one way, i.e., 78219783684 + 298874944 = 279678^2 + 17288^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78518658628.

It is not an unprimeable number, because it can be changed into a prime (78518658623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9814832325 + ... + 9814832332.

Almost surely, 2^78518658628 is an apocalyptic number.

It is an amenable number.

78518658628 is a deficient number, since it is larger than the sum of its proper divisors (58888993978).

78518658628 is a wasteful number, since it uses less digits than its factorization.

78518658628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19629664661 (or 19629664659 counting only the distinct ones).

The product of its digits is 51609600, while the sum is 64.

The spelling of 78518658628 in words is "seventy-eight billion, five hundred eighteen million, six hundred fifty-eight thousand, six hundred twenty-eight".