87817122004 has 24 divisors (see below), whose sum is σ = 155676404520. Its totient is φ = 43339862016.

The previous prime is 87817121999. The next prime is 87817122017. The reversal of 87817122004 is 40022171878.

It can be written as a sum of positive squares in 4 ways, for example, as 46547199504 + 41269922500 = 215748^2 + 203150^2 .

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, 8347 + ... + 419170.

It is an arithmetic number, because the mean of its divisors is an integer number (6486516855).

Almost surely, 2^87817122004 is an apocalyptic number.

It is an amenable number.

87817122004 is a deficient number, since it is larger than the sum of its proper divisors (67859282516).

87817122004 is a wasteful number, since it uses less digits than its factorization.

87817122004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428187 (or 428185 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 40.

The spelling of 87817122004 in words is "eighty-seven billion, eight hundred seventeen million, one hundred twenty-two thousand, four".