28505650 has 12 divisors (see below), whose sum is σ = 53020602. Its totient is φ = 11402240.

The previous prime is 28505639. The next prime is 28505683. The reversal of 28505650 is 5650582.

It can be written as a sum of positive squares in 3 ways, for example, as 26347689 + 2157961 = 5133^2 + 1469^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 285007 + ... + 285106.

Almost surely, 2^28505650 is an apocalyptic number.

28505650 is a deficient number, since it is larger than the sum of its proper divisors (24514952).

28505650 is a wasteful number, since it uses less digits than its factorization.

28505650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570125 (or 570120 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 28505650 is about 5339.0682707753. The cubic root of 28505650 is about 305.4759209675.

The spelling of 28505650 in words is "twenty-eight million, five hundred five thousand, six hundred fifty".