28328630 has 32 divisors (see below), whose sum is σ = 58903200. Its totient is φ = 9694720.

The previous prime is 28328627. The next prime is 28328633. The reversal of 28328630 is 3682382.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28328627) and next prime (28328633).

It is a super-2 number, since 2×28328630² = 1605022555353800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28328633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5705 + ... + 9444.

It is an arithmetic number, because the mean of its divisors is an integer number (1840725).

Almost surely, 2^28328630 is an apocalyptic number.

28328630 is an abundant number, since it is smaller than the sum of its proper divisors (30574570).

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

28328630 is a wasteful number, since it uses less digits than its factorization.

28328630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15184.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28328630 is about 5322.4646546501. The cubic root of 28328630 is about 304.8422726530.

The spelling of 28328630 in words is "twenty-eight million, three hundred twenty-eight thousand, six hundred thirty".