11990534988 has 12 divisors (see below), whose sum is σ = 27977915000. Its totient is φ = 3996844992.

The previous prime is 11990534971. The next prime is 11990535019. The reversal of 11990534988 is 88943509911.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×11990534988³ (a number of 31 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499605613 + ... + 499605636.

Almost surely, 2^11990534988 is an apocalyptic number.

It is an amenable number.

11990534988 is an abundant number, since it is smaller than the sum of its proper divisors (15987380012).

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

11990534988 is a wasteful number, since it uses less digits than its factorization.

11990534988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999211256 (or 999211254 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 57.

The spelling of 11990534988 in words is "eleven billion, nine hundred ninety million, five hundred thirty-four thousand, nine hundred eighty-eight".