87999020 has 24 divisors (see below), whose sum is σ = 185280144. Its totient is φ = 35107776.

The previous prime is 87999001. The next prime is 87999029. The reversal of 87999020 is 2099978.

It is not an unprimeable number, because it can be changed into a prime (87999029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2399 + ... + 13481.

It is an arithmetic number, because the mean of its divisors is an integer number (7720006).

Almost surely, 2^87999020 is an apocalyptic number.

It is an amenable number.

87999020 is an abundant number, since it is smaller than the sum of its proper divisors (97281124).

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

87999020 is a wasteful number, since it uses less digits than its factorization.

87999020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11489 (or 11487 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 87999020 is about 9380.7792853259. The cubic root of 87999020 is about 444.7943669710.

It can be divided in two parts, 879 and 99020, that added together give a palindrome (99899).

The spelling of 87999020 in words is "eighty-seven million, nine hundred ninety-nine thousand, twenty".