87909820 has 24 divisors (see below), whose sum is σ = 185172624. Its totient is φ = 35056896.

The previous prime is 87909799. The next prime is 87909821. The reversal of 87909820 is 2890978.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87909821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219 + ... + 13261.

It is an arithmetic number, because the mean of its divisors is an integer number (7715526).

Almost surely, 2^87909820 is an apocalyptic number.

It is an amenable number.

87909820 is an abundant number, since it is smaller than the sum of its proper divisors (97262804).

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

87909820 is a wasteful number, since it uses less digits than its factorization.

87909820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13389 (or 13387 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 87909820 is about 9376.0236774445. The cubic root of 87909820 is about 444.6440279074.

The spelling of 87909820 in words is "eighty-seven million, nine hundred nine thousand, eight hundred twenty".