78087043988 has 6 divisors (see below), whose sum is σ = 136652326986. Its totient is φ = 39043521992.

The previous prime is 78087043933. The next prime is 78087044053. The reversal of 78087043988 is 88934078087.

It can be written as a sum of positive squares in only one way, i.e., 75384291844 + 2702752144 = 274562^2 + 51988^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78087043988.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9760880495 + ... + 9760880502.

It is an arithmetic number, because the mean of its divisors is an integer number (22775387831).

Almost surely, 2^78087043988 is an apocalyptic number.

It is an amenable number.

78087043988 is a deficient number, since it is larger than the sum of its proper divisors (58565282998).

78087043988 is a wasteful number, since it uses less digits than its factorization.

78087043988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19521761001 (or 19521760999 counting only the distinct ones).

The product of its (nonzero) digits is 21676032, while the sum is 62.

The spelling of 78087043988 in words is "seventy-eight billion, eighty-seven million, forty-three thousand, nine hundred eighty-eight".