90687987208 has 64 divisors (see below), whose sum is σ = 209327247360. Its totient is φ = 35868462336.

The previous prime is 90687987193. The next prime is 90687987239. The reversal of 90687987208 is 80278978609.

It is a super-2 number, since 2×90687987208² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90687987208.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3994866 + ... + 4017502.

It is an arithmetic number, because the mean of its divisors is an integer number (3270738240).

Almost surely, 2^90687987208 is an apocalyptic number.

It is an amenable number.

90687987208 is an abundant number, since it is smaller than the sum of its proper divisors (118639260152).

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

90687987208 is a wasteful number, since it uses less digits than its factorization.

90687987208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28166 (or 28162 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 64.

The spelling of 90687987208 in words is "ninety billion, six hundred eighty-seven million, nine hundred eighty-seven thousand, two hundred eight".