28328130 has 80 divisors (see below), whose sum is σ = 78120504. Its totient is φ = 7361280.

The previous prime is 28328123. The next prime is 28328173. The reversal of 28328130 is 3182382.

It can be written as a sum of positive squares in 4 ways, for example, as 7834401 + 20493729 = 2799^2 + 4527^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28328094 and 28328103.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 32784 + ... + 33636.

Almost surely, 2^28328130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28328130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39060252).

28328130 is an abundant number, since it is smaller than the sum of its proper divisors (49792374).

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

28328130 is a wasteful number, since it uses less digits than its factorization.

28328130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28328130 is about 5322.4176837223. The cubic root of 28328130 is about 304.8404791549.

The spelling of 28328130 in words is "twenty-eight million, three hundred twenty-eight thousand, one hundred thirty".