987505505789 has 32 divisors (see below), whose sum is σ = 1100233152000. Its totient is φ = 878754240000.

The previous prime is 987505505743. The next prime is 987505505837.

987505505789 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987505505789 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 (987505505729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171767087 + ... + 171772835.

It is an arithmetic number, because the mean of its divisors is an integer number (34382286000).

Almost surely, 2^987505505789 is an apocalyptic number.

It is an amenable number.

987505505789 is a deficient number, since it is larger than the sum of its proper divisors (112727646211).

987505505789 is a wasteful number, since it uses less digits than its factorization.

987505505789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7013.

The product of its (nonzero) digits is 158760000, while the sum is 68.

The spelling of 987505505789 in words is "nine hundred eighty-seven billion, five hundred five million, five hundred five thousand, seven hundred eighty-nine".