87147820 has 48 divisors (see below), whose sum is σ = 189923328. Its totient is φ = 33554880.

The previous prime is 87147817. The next prime is 87147829. The reversal of 87147820 is 2874178.

It is a self number, because there is not a number n which added to its sum of digits gives 87147820.

It is not an unprimeable number, because it can be changed into a prime (87147829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227349 + ... + 227731.

It is an arithmetic number, because the mean of its divisors is an integer number (3956736).

Almost surely, 2^87147820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87147820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94961664).

87147820 is an abundant number, since it is smaller than the sum of its proper divisors (102775508).

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

87147820 is a wasteful number, since it uses less digits than its factorization.

87147820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 788 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 87147820 is about 9335.2996738187. The cubic root of 87147820 is about 443.3555770524.

The spelling of 87147820 in words is "eighty-seven million, one hundred forty-seven thousand, eight hundred twenty".