87821985 has 8 divisors (see below), whose sum is σ = 140515200. Its totient is φ = 46838384.

The previous prime is 87821927. The next prime is 87822001. The reversal of 87821985 is 58912878.

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 87821985 - 2¹² = 87817889 is a prime.

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, 2927385 + ... + 2927414.

It is an arithmetic number, because the mean of its divisors is an integer number (17564400).

Almost surely, 2^87821985 is an apocalyptic number.

It is an amenable number.

87821985 is a deficient number, since it is larger than the sum of its proper divisors (52693215).

87821985 is a wasteful number, since it uses less digits than its factorization.

87821985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5854807.

The product of its digits is 322560, while the sum is 48.

The square root of 87821985 is about 9371.3384849764. The cubic root of 87821985 is about 444.4958900286.

The spelling of 87821985 in words is "eighty-seven million, eight hundred twenty-one thousand, nine hundred eighty-five".