16776720 has 120 divisors (see below), whose sum is σ = 58496256. Its totient is φ = 4468608.

The previous prime is 16776719. The next prime is 16776731. The reversal of 16776720 is 2767761.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19009 + ... + 19871.

It is a vampire number, since it can be written as 2160 ⋅ 7767 (with its own digits).

Almost surely, 2^16776720 is an apocalyptic number.

16776720 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 16776720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29248128).

16776720 is an abundant number, since it is smaller than the sum of its proper divisors (41719536).

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

16776720 is an equidigital number, since it uses as much as digits as its factorization.

16776720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891 (or 873 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 16776720 is about 4095.9394526775. The cubic root of 16776720 is about 255.9974771887.

It can be divided in two parts, 1 and 6776720, that added together give a triangular number (6776721 = T₃₆₈₁).

The spelling of 16776720 in words is "sixteen million, seven hundred seventy-six thousand, seven hundred twenty".