16553628 has 144 divisors (see below), whose sum is σ = 53487616. Its totient is φ = 4199040.

The previous prime is 16553599. The next prime is 16553633. The reversal of 16553628 is 82635561.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 16553592 and 16553601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101475 + ... + 101637.

Almost surely, 2^16553628 is an apocalyptic number.

16553628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16553628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26743808).

16553628 is an abundant number, since it is smaller than the sum of its proper divisors (36933988).

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

16553628 is a wasteful number, since it uses less digits than its factorization.

16553628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 219 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 16553628 is about 4068.6149977603. The cubic root of 16553628 is about 254.8576829859.

The spelling of 16553628 in words is "sixteen million, five hundred fifty-three thousand, six hundred twenty-eight".