16777728 has 120 divisors (see below), whose sum is σ = 52983216. Its totient is φ = 5068800.

The previous prime is 16777723. The next prime is 16777729. The reversal of 16777728 is 82777761.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16777721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (2) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50523 + ... + 50853.

Almost surely, 2^16777728 is an apocalyptic number.

16777728 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 16777728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26491608).

16777728 is an abundant number, since it is smaller than the sum of its proper divisors (36205488).

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

16777728 is a wasteful number, since it uses less digits than its factorization.

16777728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 347 counting only the distinct ones).

The product of its digits is 230496, while the sum is 45.

The square root of 16777728 is about 4096.0624995232. The cubic root of 16777728 is about 256.0026041402.

The spelling of 16777728 in words is "sixteen million, seven hundred seventy-seven thousand, seven hundred twenty-eight".