87821132 has 18 divisors (see below), whose sum is σ = 178779132. Its totient is φ = 37637544.

The previous prime is 87821101. The next prime is 87821137. The reversal of 87821132 is 23112878.

It is a super-2 number, since 2×87821132² = 15425102451522848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87821137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223838 + ... + 224229.

It is an arithmetic number, because the mean of its divisors is an integer number (9932174).

Almost surely, 2^87821132 is an apocalyptic number.

It is an amenable number.

87821132 is an abundant number, since it is smaller than the sum of its proper divisors (90958000).

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

87821132 is a wasteful number, since it uses less digits than its factorization.

87821132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448085 (or 448076 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 87821132 is about 9371.2929737577. The cubic root of 87821132 is about 444.4944509196.

The spelling of 87821132 in words is "eighty-seven million, eight hundred twenty-one thousand, one hundred thirty-two".