28739628 has 36 divisors (see below), whose sum is σ = 76472760. Its totient is φ = 9075456.

The previous prime is 28739617. The next prime is 28739681. The reversal of 28739628 is 82693782.

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

It is an unprimeable number.

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, 20325 + ... + 21692.

Almost surely, 2^28739628 is an apocalyptic number.

It is an amenable number.

28739628 is an abundant number, since it is smaller than the sum of its proper divisors (47733132).

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

28739628 is a wasteful number, since it uses less digits than its factorization.

28739628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42046 (or 42041 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28739628 is about 5360.9353661465. The cubic root of 28739628 is about 306.3094396358.

The spelling of 28739628 in words is "twenty-eight million, seven hundred thirty-nine thousand, six hundred twenty-eight".