16390782720 has 324 divisors, whose sum is σ = 61415597880. Its totient is φ = 4034174976.

The previous prime is 16390782719. The next prime is 16390782797. The reversal of 16390782720 is 2728709361.

16390782720 is a `hidden beast` number, since 1 + 639 + 0 + 7 + 8 + 2 + 7 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1942671 + ... + 1951089.

Almost surely, 2^16390782720 is an apocalyptic number.

16390782720 is a gapful number since it is divisible by the number (10) 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 16390782720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30707798940).

16390782720 is an abundant number, since it is smaller than the sum of its proper divisors (45024815160).

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

16390782720 is a wasteful number, since it uses less digits than its factorization.

16390782720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8472 (or 8442 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 16390782720 in words is "sixteen billion, three hundred ninety million, seven hundred eighty-two thousand, seven hundred twenty".