16640530 has 8 divisors (see below), whose sum is σ = 29952972. Its totient is φ = 6656208.

The previous prime is 16640513. The next prime is 16640531. The reversal of 16640530 is 3504661.

It can be written as a sum of positive squares in 2 ways, for example, as 16216729 + 423801 = 4027^2 + 651^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 16640495 and 16640504.

It is not an unprimeable number, because it can be changed into a prime (16640531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832017 + ... + 832036.

Almost surely, 2^16640530 is an apocalyptic number.

16640530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16640530 is a deficient number, since it is larger than the sum of its proper divisors (13312442).

16640530 is a wasteful number, since it uses less digits than its factorization.

16640530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664060.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 16640530 is about 4079.2805738267. The cubic root of 16640530 is about 255.3028824443.

The spelling of 16640530 in words is "sixteen million, six hundred forty thousand, five hundred thirty".