16616640 has 112 divisors (see below), whose sum is σ = 55595520. Its totient is φ = 4193280.

The previous prime is 16616617. The next prime is 16616647. The reversal of 16616640 is 4661661.

16616640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×16616640² = 552225449779200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 16616598 and 16616607.

It is not an unprimeable number, because it can be changed into a prime (16616647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17785 + ... + 18695.

Almost surely, 2^16616640 is an apocalyptic number.

16616640 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 16616640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27797760).

16616640 is an abundant number, since it is smaller than the sum of its proper divisors (38978880).

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

16616640 is a wasteful number, since it uses less digits than its factorization.

16616640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950 (or 940 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 16616640 is about 4076.3513096886. The cubic root of 16616640 is about 255.1806486180.

The spelling of 16616640 in words is "sixteen million, six hundred sixteen thousand, six hundred forty".