78720086041 has 9 divisors (see below), whose sum is σ = 80915828511. Its totient is φ = 76582415592.

The previous prime is 78720086033. The next prime is 78720086069. The reversal of 78720086041 is 14068002787.

The square root of 78720086041 is 280571.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 70439814025 + 8280272016 = 265405^2 + 90996^2 .

It is not a de Polignac number, because 78720086041 - 2³ = 78720086033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78720086021) 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 in 8 ways as a sum of consecutive naturals, for example, 10377336 + ... + 10384918.

Almost surely, 2^78720086041 is an apocalyptic number.

78720086041 is the 280571-st square number.

78720086041 is the 140286-th centered octagonal number.

It is an amenable number.

78720086041 is a deficient number, since it is larger than the sum of its proper divisors (2195742470).

78720086041 is an frugal number, since it uses more digits than its factorization.

78720086041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15240 (or 7620 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 78720086041 in words is "seventy-eight billion, seven hundred twenty million, eighty-six thousand, forty-one".