28663650 has 36 divisors (see below), whose sum is σ = 77010882. Its totient is φ = 7643520.

The previous prime is 28663639. The next prime is 28663673. The reversal of 28663650 is 5636682.

It can be written as a sum of positive squares in 3 ways, for example, as 13242321 + 15421329 = 3639^2 + 3927^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 31399 + ... + 32298.

Almost surely, 2^28663650 is an apocalyptic number.

28663650 is an abundant number, since it is smaller than the sum of its proper divisors (48347232).

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

28663650 is a wasteful number, since it uses less digits than its factorization.

28663650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63715 (or 63707 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 28663650 is about 5353.8444131297. The cubic root of 28663650 is about 306.0392747231.

It can be divided in two parts, 286 and 63650, that added together give a palindrome (63936).

The spelling of 28663650 in words is "twenty-eight million, six hundred sixty-three thousand, six hundred fifty".