28208630 has 8 divisors (see below), whose sum is σ = 50775552. Its totient is φ = 11283448.

The previous prime is 28208581. The next prime is 28208641. The reversal of 28208630 is 3680282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28208593 and 28208602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1410422 + ... + 1410441.

It is an arithmetic number, because the mean of its divisors is an integer number (6346944).

Almost surely, 2^28208630 is an apocalyptic number.

28208630 is a deficient number, since it is larger than the sum of its proper divisors (22566922).

28208630 is a wasteful number, since it uses less digits than its factorization.

28208630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820870.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28208630 is about 5311.1797182923. The cubic root of 28208630 is about 304.4112264280.

The spelling of 28208630 in words is "twenty-eight million, two hundred eight thousand, six hundred thirty".