78720908722 has 8 divisors (see below), whose sum is σ = 118084689900. Its totient is φ = 39359345424.

The previous prime is 78720908711. The next prime is 78720908731. The reversal of 78720908722 is 22780902787.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 70990806481 + 7730102241 = 266441^2 + 87921^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 78720908722.

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 3 ways as a sum of consecutive naturals, for example, 462697 + ... + 609532.

Almost surely, 2^78720908722 is an apocalyptic number.

78720908722 is a deficient number, since it is larger than the sum of its proper divisors (39363781178).

78720908722 is a wasteful number, since it uses less digits than its factorization.

78720908722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108940.

The product of its (nonzero) digits is 1580544, while the sum is 52.

The spelling of 78720908722 in words is "seventy-eight billion, seven hundred twenty million, nine hundred eight thousand, seven hundred twenty-two".