87720442214401 has 4 divisors (see below), whose sum is σ = 87721226742100. Its totient is φ = 87719657686704.

The previous prime is 87720442214351. The next prime is 87720442214407. The reversal of 87720442214401 is 10441224402778.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63135356242176 + 24585085972225 = 7945776^2 + 4958335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87720442214401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87720442214407) by changing a digit.

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, 392096106 + ... + 392319763.

It is an arithmetic number, because the mean of its divisors is an integer number (21930306685525).

Almost surely, 2^{87720442214401} is an apocalyptic number.

It is an amenable number.

87720442214401 is a deficient number, since it is larger than the sum of its proper divisors (784527699).

87720442214401 is a wasteful number, since it uses less digits than its factorization.

87720442214401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784527698.

The product of its (nonzero) digits is 802816, while the sum is 46.

The spelling of 87720442214401 in words is "eighty-seven trillion, seven hundred twenty billion, four hundred forty-two million, two hundred fourteen thousand, four hundred one".