87821992 has 16 divisors (see below), whose sum is σ = 167124960. Its totient is φ = 43255344.

The previous prime is 87821927. The next prime is 87822001. The reversal of 87821992 is 29912878.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81388 + ... + 82459.

It is an arithmetic number, because the mean of its divisors is an integer number (10445310).

Almost surely, 2^87821992 is an apocalyptic number.

It is an amenable number.

87821992 is a deficient number, since it is larger than the sum of its proper divisors (79302968).

87821992 is a wasteful number, since it uses less digits than its factorization.

87821992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163920 (or 163916 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 87821992 is about 9371.3388584556. The cubic root of 87821992 is about 444.4959018384.

The spelling of 87821992 in words is "eighty-seven million, eight hundred twenty-one thousand, nine hundred ninety-two".