1587217856 has 112 divisors (see below), whose sum is σ = 3878031360. Its totient is φ = 629544960.

The previous prime is 1587217847. The next prime is 1587217861. The reversal of 1587217856 is 6587127851.

It is a tau number, because it is divible by the number of its divisors (112).

1587217856 is a modest number, since divided by 17856 gives 15872 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316940 + ... + 321908.

It is an arithmetic number, because the mean of its divisors is an integer number (34625280).

Almost surely, 2^1587217856 is an apocalyptic number.

1587217856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1587217856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1939015680).

1587217856 is an abundant number, since it is smaller than the sum of its proper divisors (2290813504).

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

1587217856 is a wasteful number, since it uses less digits than its factorization.

1587217856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5042 (or 5032 counting only the distinct ones).

The product of its digits is 940800, while the sum is 50.

The square root of 1587217856 is about 39839.9028111264. The cubic root of 1587217856 is about 1166.4841629442.

The spelling of 1587217856 in words is "one billion, five hundred eighty-seven million, two hundred seventeen thousand, eight hundred fifty-six".