15582987868 has 54 divisors (see below), whose sum is σ = 32246133864. Its totient is φ = 6454497600.

The previous prime is 15582987857. The next prime is 15582987943. The reversal of 15582987868 is 86878928551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 20476608 + ... + 20477368.

Almost surely, 2^15582987868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15582987868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16123066932).

15582987868 is an abundant number, since it is smaller than the sum of its proper divisors (16663145996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15582987868 is an frugal number, since it uses more digits than its factorization.

15582987868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595 (or 801 counting only the distinct ones).

The product of its digits is 77414400, while the sum is 67.

The spelling of 15582987868 in words is "fifteen billion, five hundred eighty-two million, nine hundred eighty-seven thousand, eight hundred sixty-eight".