28157628 has 24 divisors (see below), whose sum is σ = 66942288. Its totient is φ = 9208576.

The previous prime is 28157609. The next prime is 28157659. The reversal of 28157628 is 82675182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21501 + ... + 22772.

It is an arithmetic number, because the mean of its divisors is an integer number (2789262).

Almost surely, 2^28157628 is an apocalyptic number.

It is an amenable number.

28157628 is an abundant number, since it is smaller than the sum of its proper divisors (38784660).

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

28157628 is a wasteful number, since it uses less digits than its factorization.

28157628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44333 (or 44331 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 28157628 is about 5306.3761645779. The cubic root of 28157628 is about 304.2276543831.

The spelling of 28157628 in words is "twenty-eight million, one hundred fifty-seven thousand, six hundred twenty-eight".