28730628 has 36 divisors (see below), whose sum is σ = 72807280. Its totient is φ = 9552816.

The previous prime is 28730623. The next prime is 28730633. The reversal of 28730628 is 82603782.

It is a happy number.

28730628 is a `hidden beast` number, since 28 + 7 + 3 + 0 + 628 = 666.

It is an interprime number because it is at equal distance from previous prime (28730623) and next prime (28730633).

It is a tau number, because it is divible by the number of its divisors (36).

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 = 28730592 and 28730601.

It is not an unprimeable number, because it can be changed into a prime (28730621) 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 11 ways as a sum of consecutive naturals, for example, 18963 + ... + 20421.

Almost surely, 2^28730628 is an apocalyptic number.

It is an amenable number.

28730628 is an abundant number, since it is smaller than the sum of its proper divisors (44076652).

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

28730628 is a wasteful number, since it uses less digits than its factorization.

28730628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016 (or 2011 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28730628 is about 5360.0958946646. The cubic root of 28730628 is about 306.2774620383.

The spelling of 28730628 in words is "twenty-eight million, seven hundred thirty thousand, six hundred twenty-eight".