16388780728 has 32 divisors (see below), whose sum is σ = 31045528800. Its totient is φ = 8110067328.

The previous prime is 16388780717. The next prime is 16388780729. The reversal of 16388780728 is 82708788361.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16388780729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1700050 + ... + 1709662.

It is an arithmetic number, because the mean of its divisors is an integer number (970172775).

Almost surely, 2^16388780728 is an apocalyptic number.

It is an amenable number.

16388780728 is a deficient number, since it is larger than the sum of its proper divisors (14656748072).

16388780728 is a wasteful number, since it uses less digits than its factorization.

16388780728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11791 (or 11787 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 58.

The spelling of 16388780728 in words is "sixteen billion, three hundred eighty-eight million, seven hundred eighty thousand, seven hundred twenty-eight".