16649604 has 48 divisors (see below), whose sum is σ = 44567040. Its totient is φ = 5369760.

The previous prime is 16649603. The next prime is 16649617. The reversal of 16649604 is 40694661.

16649604 is a `hidden beast` number, since 1 + 6 + 6 + 49 + 604 = 666.

16649604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (16649603) 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, 862 + ... + 5834.

It is an arithmetic number, because the mean of its divisors is an integer number (928480).

Almost surely, 2^16649604 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 16649604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22283520).

16649604 is an abundant number, since it is smaller than the sum of its proper divisors (27917436).

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

16649604 is a wasteful number, since it uses less digits than its factorization.

16649604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5017 (or 5009 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 16649604 is about 4080.3926281670. The cubic root of 16649604 is about 255.3492791516.

It can be divided in two parts, 166 and 49604, that added together give a triangular number (49770 = T₃₁₅).

The spelling of 16649604 in words is "sixteen million, six hundred forty-nine thousand, six hundred four".