16555428 has 60 divisors (see below), whose sum is σ = 44481052. Its totient is φ = 5365440.

The previous prime is 16555417. The next prime is 16555439. The reversal of 16555428 is 82455561.

It is an interprime number because it is at equal distance from previous prime (16555417) and next prime (16555439).

It can be written as a sum of positive squares in 2 ways, for example, as 11573604 + 4981824 = 3402^2 + 2232^2 .

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

It is a zygodrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 16555392 and 16555401.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11298 + ... + 12678.

Almost surely, 2^16555428 is an apocalyptic number.

16555428 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 16555428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22240526).

16555428 is an abundant number, since it is smaller than the sum of its proper divisors (27925624).

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

16555428 is a wasteful number, since it uses less digits than its factorization.

16555428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1434 (or 1423 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 16555428 is about 4068.8361972436. The cubic root of 16555428 is about 254.8669201795.

The spelling of 16555428 in words is "sixteen million, five hundred fifty-five thousand, four hundred twenty-eight".