28156628 has 12 divisors (see below), whose sum is σ = 49405440. Its totient is φ = 14040792.

The previous prime is 28156591. The next prime is 28156631. The reversal of 28156628 is 82665182.

It is a junction number, because it is equal to n+sod(n) for n = 28156591 and 28156600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7658 + ... + 10721.

It is an arithmetic number, because the mean of its divisors is an integer number (4117120).

Almost surely, 2^28156628 is an apocalyptic number.

It is an amenable number.

28156628 is a deficient number, since it is larger than the sum of its proper divisors (21248812).

28156628 is a wasteful number, since it uses less digits than its factorization.

28156628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18766 (or 18764 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 28156628 is about 5306.2819374775. The cubic root of 28156628 is about 304.2240528575.

The spelling of 28156628 in words is "twenty-eight million, one hundred fifty-six thousand, six hundred twenty-eight".