87271820 has 24 divisors (see below), whose sum is σ = 189184128. Its totient is φ = 33782400.

The previous prime is 87271783. The next prime is 87271841. The reversal of 87271820 is 2817278.

It is a super-2 number, since 2×87271820² = 15232741132224800, which contains 22 as substring.

It is an unprimeable number.

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, 69761 + ... + 71000.

It is an arithmetic number, because the mean of its divisors is an integer number (7882672).

Almost surely, 2^87271820 is an apocalyptic number.

It is an amenable number.

87271820 is an abundant number, since it is smaller than the sum of its proper divisors (101912308).

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

87271820 is a wasteful number, since it uses less digits than its factorization.

87271820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140801 (or 140799 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 87271820 is about 9341.9387709404. The cubic root of 87271820 is about 443.5657564829.

The spelling of 87271820 in words is "eighty-seven million, two hundred seventy-one thousand, eight hundred twenty".