87219018386729 has 4 divisors (see below), whose sum is σ = 92349548880084. Its totient is φ = 82088487893376.

The previous prime is 87219018386707. The next prime is 87219018386767. The reversal of 87219018386729 is 92768381091278.

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 27812460157504 + 59406558229225 = 5273752^2 + 7707565^2 .

It is a cyclic number.

It is not a de Polignac number, because 87219018386729 - 2¹² = 87219018382633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87219018386779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565265246652 + ... + 2565265246685.

It is an arithmetic number, because the mean of its divisors is an integer number (23087387220021).

Almost surely, 2^{87219018386729} is an apocalyptic number.

It is an amenable number.

87219018386729 is a deficient number, since it is larger than the sum of its proper divisors (5130530493355).

87219018386729 is a wasteful number, since it uses less digits than its factorization.

87219018386729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130530493354.

The product of its (nonzero) digits is 146313216, while the sum is 71.

The spelling of 87219018386729 in words is "eighty-seven trillion, two hundred nineteen billion, eighteen million, three hundred eighty-six thousand, seven hundred twenty-nine".