987905868509789 has 8 divisors (see below), whose sum is σ = 1054831746357312. Its totient is φ = 922977778060800.

The previous prime is 987905868509783. The next prime is 987905868509827.

987905868509789 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 987905868509789 - 2²⁰ = 987905867461213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 987905868509695 and 987905868509704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987905868509783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499446848612 + ... + 499446850589.

It is an arithmetic number, because the mean of its divisors is an integer number (131853968294664).

Almost surely, 2^{987905868509789} is an apocalyptic number.

It is an amenable number.

987905868509789 is a deficient number, since it is larger than the sum of its proper divisors (66925877847523).

987905868509789 is a wasteful number, since it uses less digits than its factorization.

987905868509789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998893699267.

The product of its (nonzero) digits is 197522841600, while the sum is 98.

The spelling of 987905868509789 in words is "nine hundred eighty-seven trillion, nine hundred five billion, eight hundred sixty-eight million, five hundred nine thousand, seven hundred eighty-nine".