999987943608 has 80 divisors (see below), whose sum is σ = 2801354388360. Its totient is φ = 333274305600.

The previous prime is 999987943501. The next prime is 999987943609. The reversal of 999987943608 is 806349789999.

999987943608 is a `hidden beast` number, since 9 + 9 + 99 + 87 + 94 + 360 + 8 = 666.

It is a super-2 number, since 2×999987943608² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999987943609) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3900498 + ... + 4148958.

Almost surely, 2^999987943608 is an apocalyptic number.

It is an amenable number.

999987943608 is an abundant number, since it is smaller than the sum of its proper divisors (1801366444752).

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

999987943608 is a wasteful number, since it uses less digits than its factorization.

999987943608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254690 (or 254677 counting only the distinct ones).

The product of its (nonzero) digits is 1904684544, while the sum is 81.

The spelling of 999987943608 in words is "nine hundred ninety-nine billion, nine hundred eighty-seven million, nine hundred forty-three thousand, six hundred eight".