28681628 has 12 divisors (see below), whose sum is σ = 50942472. Its totient is φ = 14126640.

The previous prime is 28681619. The next prime is 28681633. The reversal of 28681628 is 82618682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53243 + ... + 53778.

It is an arithmetic number, because the mean of its divisors is an integer number (4245206).

Almost surely, 2^28681628 is an apocalyptic number.

It is an amenable number.

28681628 is a deficient number, since it is larger than the sum of its proper divisors (22260844).

28681628 is a wasteful number, since it uses less digits than its factorization.

28681628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107092 (or 107090 counting only the distinct ones).

The product of its digits is 73728, while the sum is 41.

The square root of 28681628 is about 5355.5231303767. The cubic root of 28681628 is about 306.1032445268.

The spelling of 28681628 in words is "twenty-eight million, six hundred eighty-one thousand, six hundred twenty-eight".