87198220808 has 8 divisors (see below), whose sum is σ = 163496664030. Its totient is φ = 43599110400.

The previous prime is 87198220807. The next prime is 87198220927. The reversal of 87198220808 is 80802289178.

It can be written as a sum of positive squares in only one way, i.e., 58236307684 + 28961913124 = 241322^2 + 170182^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 87198220808.

It is not an unprimeable number, because it can be changed into a prime (87198220807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5449888793 + ... + 5449888808.

Almost surely, 2^87198220808 is an apocalyptic number.

It is an amenable number.

87198220808 is a deficient number, since it is larger than the sum of its proper divisors (76298443222).

87198220808 is a wasteful number, since it uses less digits than its factorization.

87198220808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10899777607 (or 10899777603 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 53.

The spelling of 87198220808 in words is "eighty-seven billion, one hundred ninety-eight million, two hundred twenty thousand, eight hundred eight".