16447428 has 48 divisors (see below), whose sum is σ = 43296960. Its totient is φ = 5398272.

The previous prime is 16447427. The next prime is 16447433. The reversal of 16447428 is 82474461.

16447428 is a `hidden beast` number, since 1 + 644 + 7 + 4 + 2 + 8 = 666.

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 = 16447392 and 16447401.

It is not an unprimeable number, because it can be changed into a prime (16447427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6100 + ... + 8372.

It is an arithmetic number, because the mean of its divisors is an integer number (902020).

Almost surely, 2^16447428 is an apocalyptic number.

16447428 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 16447428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21648480).

16447428 is an abundant number, since it is smaller than the sum of its proper divisors (26849532).

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

16447428 is a wasteful number, since it uses less digits than its factorization.

16447428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353 (or 2345 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 16447428 is about 4055.5428736484. The cubic root of 16447428 is about 254.3114991197.

The spelling of 16447428 in words is "sixteen million, four hundred forty-seven thousand, four hundred twenty-eight".