16404720 has 80 divisors (see below), whose sum is σ = 52630560. Its totient is φ = 4221952.

The previous prime is 16404709. The next prime is 16404757. The reversal of 16404720 is 2740461.

16404720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×16404720² = 538229676556800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5782 + ... + 8138.

It is an arithmetic number, because the mean of its divisors is an integer number (657882).

Almost surely, 2^16404720 is an apocalyptic number.

16404720 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 16404720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26315280).

16404720 is an abundant number, since it is smaller than the sum of its proper divisors (36225840).

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

16404720 is a wasteful number, since it uses less digits than its factorization.

16404720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402 (or 2396 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 16404720 is about 4050.2740648010. The cubic root of 16404720 is about 254.0911901065.

The spelling of 16404720 in words is "sixteen million, four hundred four thousand, seven hundred twenty".