28356628 has 6 divisors (see below), whose sum is σ = 49624106. Its totient is φ = 14178312.

The previous prime is 28356623. The next prime is 28356649. The reversal of 28356628 is 82665382.

It can be written as a sum of positive squares in only one way, i.e., 23639044 + 4717584 = 4862^2 + 2172^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28356623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3544575 + ... + 3544582.

Almost surely, 2^28356628 is an apocalyptic number.

It is an amenable number.

28356628 is a deficient number, since it is larger than the sum of its proper divisors (21267478).

28356628 is a wasteful number, since it uses less digits than its factorization.

28356628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7089161 (or 7089159 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 28356628 is about 5325.0941775709. The cubic root of 28356628 is about 304.9426677151.

The spelling of 28356628 in words is "twenty-eight million, three hundred fifty-six thousand, six hundred twenty-eight".