87387917922 has 18 divisors (see below), whose sum is σ = 189343206273. Its totient is φ = 29128887912.

The previous prime is 87387917921. The next prime is 87387917989. The reversal of 87387917922 is 22971978378.

87387917922 is a `hidden beast` number, since 87 + 387 + 9 + 179 + 2 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 50688469881 + 36699448041 = 225141^2 + 191571^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=209031.

It is a self number, because there is not a number n which added to its sum of digits gives 87387917922.

It is not an unprimeable number, because it can be changed into a prime (87387917921) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1219348 + ... + 1289024.

Almost surely, 2^87387917922 is an apocalyptic number.

87387917922 is an abundant number, since it is smaller than the sum of its proper divisors (101955288351).

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

87387917922 is an frugal number, since it uses more digits than its factorization.

87387917922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139362 (or 69682 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The spelling of 87387917922 in words is "eighty-seven billion, three hundred eighty-seven million, nine hundred seventeen thousand, nine hundred twenty-two".