7280028 has 54 divisors (see below), whose sum is σ = 21411936. Its totient is φ = 2079504.

The previous prime is 7280011. The next prime is 7280033. The reversal of 7280028 is 8200827.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 7279983 and 7280010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 300 + ... + 3827.

Almost surely, 2^7280028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7280028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10705968).

7280028 is an abundant number, since it is smaller than the sum of its proper divisors (14131908).

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

7280028 is a wasteful number, since it uses less digits than its factorization.

7280028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4151 (or 4139 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 7280028 is about 2698.1527013866. The cubic root of 7280028 is about 193.8106701433.

The spelling of 7280028 in words is "seven million, two hundred eighty thousand, twenty-eight".