87506328509 has 4 divisors (see below), whose sum is σ = 87508139004. Its totient is φ = 87504518016.

The previous prime is 87506328499. The next prime is 87506328529. The reversal of 87506328509 is 90582360578.

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 6510876100 + 80995452409 = 80690^2 + 284597^2 .

It is a cyclic number.

It is not a de Polignac number, because 87506328509 - 2¹² = 87506324413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87506328529) 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, 830702 + ... + 930095.

It is an arithmetic number, because the mean of its divisors is an integer number (21877034751).

Almost surely, 2^87506328509 is an apocalyptic number.

It is an amenable number.

87506328509 is a deficient number, since it is larger than the sum of its proper divisors (1810495).

87506328509 is a wasteful number, since it uses less digits than its factorization.

87506328509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810494.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 87506328509 in words is "eighty-seven billion, five hundred six million, three hundred twenty-eight thousand, five hundred nine".