16650400 has 72 divisors (see below), whose sum is σ = 43801884. Its totient is φ = 6144000.

The previous prime is 16650397. The next prime is 16650433. The reversal of 16650400 is 405661.

It can be written as a sum of positive squares in 6 ways, for example, as 8832784 + 7817616 = 2972^2 + 2796^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9600 + ... + 11200.

Almost surely, 2^16650400 is an apocalyptic number.

16650400 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 16650400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21900942).

16650400 is an abundant number, since it is smaller than the sum of its proper divisors (27151484).

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

16650400 is a wasteful number, since it uses less digits than its factorization.

16650400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634 (or 1621 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 16650400 is about 4080.4901666344. The cubic root of 16650400 is about 255.3533484133.

The spelling of 16650400 in words is "sixteen million, six hundred fifty thousand, four hundred".