87168990722 has 18 divisors (see below), whose sum is σ = 143728346979. Its totient is φ = 39620180820.

The previous prime is 87168990707. The next prime is 87168990749. The reversal of 87168990722 is 22709986178.

It can be written as a sum of positive squares in only one way, i.e., 43584495361 + 43584495361 = 208769^2 + 208769^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=208769.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4583429 + ... + 4602407.

Almost surely, 2^87168990722 is an apocalyptic number.

87168990722 is a deficient number, since it is larger than the sum of its proper divisors (56559356257).

87168990722 is an frugal number, since it uses more digits than its factorization.

87168990722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37982 (or 18992 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 59.

The spelling of 87168990722 in words is "eighty-seven billion, one hundred sixty-eight million, nine hundred ninety thousand, seven hundred twenty-two".