16628197 has 4 divisors (see below), whose sum is σ = 16655680. Its totient is φ = 16600716.

The previous prime is 16628189. The next prime is 16628203. The reversal of 16628197 is 79182661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79182661 = 59 ⋅1342079.

It is a cyclic number.

It is not a de Polignac number, because 16628197 - 2³ = 16628189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16623197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12813 + ... + 14050.

It is an arithmetic number, because the mean of its divisors is an integer number (4163920).

Almost surely, 2^16628197 is an apocalyptic number.

It is an amenable number.

16628197 is a deficient number, since it is larger than the sum of its proper divisors (27483).

16628197 is an equidigital number, since it uses as much as digits as its factorization.

16628197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27482.

The product of its digits is 36288, while the sum is 40.

The square root of 16628197 is about 4077.7686300230. The cubic root of 16628197 is about 255.2397949377.

The spelling of 16628197 in words is "sixteen million, six hundred twenty-eight thousand, one hundred ninety-seven".