87821180 has 24 divisors (see below), whose sum is σ = 188924400. Its totient is φ = 34271360.

The previous prime is 87821177. The next prime is 87821203. The reversal of 87821180 is 8112878.

It is a self number, because there is not a number n which added to its sum of digits gives 87821180.

It is a congruent number.

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, 52730 + ... + 54369.

It is an arithmetic number, because the mean of its divisors is an integer number (7871850).

Almost surely, 2^87821180 is an apocalyptic number.

It is an amenable number.

87821180 is an abundant number, since it is smaller than the sum of its proper divisors (101103220).

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

87821180 is a wasteful number, since it uses less digits than its factorization.

87821180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107149 (or 107147 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 87821180 is about 9371.2955347700. The cubic root of 87821180 is about 444.4945319014.

The spelling of 87821180 in words is "eighty-seven million, eight hundred twenty-one thousand, one hundred eighty".