87730455217 has 4 divisors (see below), whose sum is σ = 87753588580. Its totient is φ = 87707321856.

The previous prime is 87730455181. The next prime is 87730455233. The reversal of 87730455217 is 71255403778.

It is a happy number.

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 50557072801 + 37173382416 = 224849^2 + 192804^2 .

It is a cyclic number.

It is not a de Polignac number, because 87730455217 - 2²⁷ = 87596237489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87730452217) 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, 11560992 + ... + 11568577.

It is an arithmetic number, because the mean of its divisors is an integer number (21938397145).

Almost surely, 2^87730455217 is an apocalyptic number.

It is an amenable number.

87730455217 is a deficient number, since it is larger than the sum of its proper divisors (23133363).

87730455217 is a wasteful number, since it uses less digits than its factorization.

87730455217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23133362.

The product of its (nonzero) digits is 1646400, while the sum is 49.

The spelling of 87730455217 in words is "eighty-seven billion, seven hundred thirty million, four hundred fifty-five thousand, two hundred seventeen".