87998991808 has 336 divisors, whose sum is σ = 225255673440. Its totient is φ = 33794482176.

The previous prime is 87998991767. The next prime is 87998991809. The reversal of 87998991808 is 80819989978.

It is a super-2 number, since 2×87998991808² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87998991809) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 300337710 + ... + 300338002.

It is an arithmetic number, because the mean of its divisors is an integer number (670403790).

Almost surely, 2^87998991808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87998991808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112627836720).

87998991808 is an abundant number, since it is smaller than the sum of its proper divisors (137256681632).

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

87998991808 is a wasteful number, since it uses less digits than its factorization.

87998991808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 507 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 76.

The spelling of 87998991808 in words is "eighty-seven billion, nine hundred ninety-eight million, nine hundred ninety-one thousand, eight hundred eight".