28728650 has 48 divisors (see below), whose sum is σ = 56105784. Its totient is φ = 10932480.

The previous prime is 28728649. The next prime is 28728673. The reversal of 28728650 is 5682782.

It can be written as a sum of positive squares in 12 ways, for example, as 16736281 + 11992369 = 4091^2 + 3463^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97904 + ... + 98196.

Almost surely, 2^28728650 is an apocalyptic number.

28728650 is a deficient number, since it is larger than the sum of its proper divisors (27377134).

28728650 is a wasteful number, since it uses less digits than its factorization.

28728650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 28728650 is about 5359.9113798644. The cubic root of 28728650 is about 306.2704331778.

The spelling of 28728650 in words is "twenty-eight million, seven hundred twenty-eight thousand, six hundred fifty".