87820540 has 12 divisors (see below), whose sum is σ = 184423176. Its totient is φ = 35128208.

The previous prime is 87820529. The next prime is 87820547. The reversal of 87820540 is 4502878.

It is a junction number, because it is equal to n+sod(n) for n = 87820496 and 87820505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87820547) 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 3 ways as a sum of consecutive naturals, for example, 2195494 + ... + 2195533.

It is an arithmetic number, because the mean of its divisors is an integer number (15368598).

Almost surely, 2^87820540 is an apocalyptic number.

It is an amenable number.

87820540 is an abundant number, since it is smaller than the sum of its proper divisors (96602636).

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

87820540 is a wasteful number, since it uses less digits than its factorization.

87820540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4391036 (or 4391034 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 87820540 is about 9371.2613878816. The cubic root of 87820540 is about 444.4934521422.

The spelling of 87820540 in words is "eighty-seven million, eight hundred twenty thousand, five hundred forty".