78720086042 has 8 divisors (see below), whose sum is σ = 127163215956. Its totient is φ = 36332347392.

The previous prime is 78720086033. The next prime is 78720086069. The reversal of 78720086042 is 24068002787.

It is a Cunningham number, because it is equal to 280571²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 78720086041 + 1 = 280571^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 78720085984 and 78720086002.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1513847783 + ... + 1513847834.

Almost surely, 2^78720086042 is an apocalyptic number.

78720086042 is a deficient number, since it is larger than the sum of its proper divisors (48443129914).

78720086042 is a wasteful number, since it uses less digits than its factorization.

78720086042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3027695632.

The product of its (nonzero) digits is 301056, while the sum is 44.

The spelling of 78720086042 in words is "seventy-eight billion, seven hundred twenty million, eighty-six thousand, forty-two".