16491990528 has 320 divisors, whose sum is σ = 52989108480. Its totient is φ = 5034369024.

The previous prime is 16491990503. The next prime is 16491990577. The reversal of 16491990528 is 82509919461.

16491990528 is a `hidden beast` number, since 16 + 4 + 9 + 19 + 90 + 528 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29292775 + ... + 29293337.

It is an arithmetic number, because the mean of its divisors is an integer number (165590964).

Almost surely, 2^16491990528 is an apocalyptic number.

16491990528 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16491990528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26494554240).

16491990528 is an abundant number, since it is smaller than the sum of its proper divisors (36497117952).

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

16491990528 is a wasteful number, since it uses less digits than its factorization.

16491990528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 744 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 16491990528 in words is "sixteen billion, four hundred ninety-one million, nine hundred ninety thousand, five hundred twenty-eight".