87822820 has 24 divisors (see below), whose sum is σ = 188927928. Its totient is φ = 34272000.

The previous prime is 87822803. The next prime is 87822877. The reversal of 87822820 is 2822878.

It can be written as a sum of positive squares in 4 ways, for example, as 5992704 + 81830116 = 2448^2 + 9046^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 87822820.

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, 52731 + ... + 54370.

It is an arithmetic number, because the mean of its divisors is an integer number (7871997).

Almost surely, 2^87822820 is an apocalyptic number.

It is an amenable number.

87822820 is an abundant number, since it is smaller than the sum of its proper divisors (101105108).

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

87822820 is a wasteful number, since it uses less digits than its factorization.

87822820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107151 (or 107149 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 37.

The square root of 87822820 is about 9371.3830356037. The cubic root of 87822820 is about 444.4972987605.

The spelling of 87822820 in words is "eighty-seven million, eight hundred twenty-two thousand, eight hundred twenty".