16672005 has 36 divisors (see below), whose sum is σ = 33620652. Its totient is φ = 7620480.

The previous prime is 16672001. The next prime is 16672009. The reversal of 16672005 is 50027661.

It is an interprime number because it is at equal distance from previous prime (16672001) and next prime (16672009).

It can be written as a sum of positive squares in 2 ways, for example, as 4955076 + 11716929 = 2226^2 + 3423^2 .

It is not a de Polignac number, because 16672005 - 2² = 16672001 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16672005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16672001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1576 + ... + 5985.

It is an arithmetic number, because the mean of its divisors is an integer number (933907).

Almost surely, 2^16672005 is an apocalyptic number.

16672005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16672005 is an abundant number, since it is smaller than the sum of its proper divisors (16948647).

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

16672005 is a wasteful number, since it uses less digits than its factorization.

16672005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7586 (or 7576 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 16672005 is about 4083.1366619304. The cubic root of 16672005 is about 255.4637466545.

Adding to 16672005 its reverse (50027661), we get a palindrome (66699666).

The spelling of 16672005 in words is "sixteen million, six hundred seventy-two thousand, five".