28645650 has 120 divisors (see below), whose sum is σ = 86963184. Its totient is φ = 6933600.

The previous prime is 28645633. The next prime is 28645651. The reversal of 28645650 is 5654682.

28645650 is a `hidden beast` number, since 2 + 8 + 645 + 6 + 5 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (28645651) by changing a digit.

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 59 ways as a sum of consecutive naturals, for example, 44229 + ... + 44871.

Almost surely, 2^28645650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28645650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43481592).

28645650 is an abundant number, since it is smaller than the sum of its proper divisors (58317534).

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

28645650 is a wasteful number, since it uses less digits than its factorization.

28645650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678 (or 664 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 28645650 is about 5352.1631141063. The cubic root of 28645650 is about 305.9751998355.

The spelling of 28645650 in words is "twenty-eight million, six hundred forty-five thousand, six hundred fifty".