16628457 has 4 divisors (see below), whose sum is σ = 22171280. Its totient is φ = 11085636.

The previous prime is 16628399. The next prime is 16628461. The reversal of 16628457 is 75482661.

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: 75482661 = 3 ⋅25160887.

It is not a de Polignac number, because 16628457 - 2⁶ = 16628393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16628467) 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, 2771407 + ... + 2771412.

It is an arithmetic number, because the mean of its divisors is an integer number (5542820).

Almost surely, 2^16628457 is an apocalyptic number.

It is an amenable number.

16628457 is a deficient number, since it is larger than the sum of its proper divisors (5542823).

16628457 is an equidigital number, since it uses as much as digits as its factorization.

16628457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5542822.

The product of its digits is 80640, while the sum is 39.

The square root of 16628457 is about 4077.8005100789. The cubic root of 16628457 is about 255.2411252483.

The spelling of 16628457 in words is "sixteen million, six hundred twenty-eight thousand, four hundred fifty-seven".