87981856 has 48 divisors (see below), whose sum is σ = 187306560. Its totient is φ = 40538880.

The previous prime is 87981847. The next prime is 87981869. The reversal of 87981856 is 65818978.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20541 + ... + 24451.

It is an arithmetic number, because the mean of its divisors is an integer number (3902220).

Almost surely, 2^87981856 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 87981856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93653280).

87981856 is an abundant number, since it is smaller than the sum of its proper divisors (99324704).

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

87981856 is a wasteful number, since it uses less digits than its factorization.

87981856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977 (or 3969 counting only the distinct ones).

The product of its digits is 967680, while the sum is 52.

The square root of 87981856 is about 9379.8643913438. The cubic root of 87981856 is about 444.7654463954.

The spelling of 87981856 in words is "eighty-seven million, nine hundred eighty-one thousand, eight hundred fifty-six".