16778916 has 72 divisors (see below), whose sum is σ = 52887744. Its totient is φ = 4357440.

The previous prime is 16778911. The next prime is 16778917. The reversal of 16778916 is 61987761.

It is not an unprimeable number, because it can be changed into a prime (16778911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 255 + ... + 5798.

It is an arithmetic number, because the mean of its divisors is an integer number (734552).

Almost surely, 2^16778916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16778916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26443872).

16778916 is an abundant number, since it is smaller than the sum of its proper divisors (36108828).

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

16778916 is a wasteful number, since it uses less digits than its factorization.

16778916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6081 (or 6076 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 16778916 is about 4096.2075142746. The cubic root of 16778916 is about 256.0086463551.

The spelling of 16778916 in words is "sixteen million, seven hundred seventy-eight thousand, nine hundred sixteen".