16389877788 has 36 divisors (see below), whose sum is σ = 42311461920. Its totient is φ = 5347051776.

The previous prime is 16389877739. The next prime is 16389877813. The reversal of 16389877788 is 88777898361.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4841653 + ... + 4845036.

Almost surely, 2^16389877788 is an apocalyptic number.

16389877788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

16389877788 is an abundant number, since it is smaller than the sum of its proper divisors (25921584132).

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

16389877788 is a wasteful number, since it uses less digits than its factorization.

16389877788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9686746 (or 9686741 counting only the distinct ones).

The product of its digits is 227598336, while the sum is 72.

The spelling of 16389877788 in words is "sixteen billion, three hundred eighty-nine million, eight hundred seventy-seven thousand, seven hundred eighty-eight".