16628556 has 24 divisors (see below), whose sum is σ = 44343040. Its totient is φ = 4750992.

The previous prime is 16628551. The next prime is 16628561. The reversal of 16628556 is 65582661.

It is an interprime number because it is at equal distance from previous prime (16628551) and next prime (16628561).

It is not an unprimeable number, because it can be changed into a prime (16628551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98896 + ... + 99063.

Almost surely, 2^16628556 is an apocalyptic number.

It is an amenable number.

16628556 is an abundant number, since it is smaller than the sum of its proper divisors (27714484).

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

16628556 is a wasteful number, since it uses less digits than its factorization.

16628556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197973 (or 197971 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 16628556 is about 4077.8126489578. The cubic root of 16628556 is about 255.2416317860.

The spelling of 16628556 in words is "sixteen million, six hundred twenty-eight thousand, five hundred fifty-six".