28731650 has 24 divisors (see below), whose sum is σ = 53611524. Its totient is φ = 11456000.

The previous prime is 28731631. The next prime is 28731701. The reversal of 28731650 is 5613782.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 24275329 + 4456321 = 4927^2 + 2111^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 19334 + ... + 20766.

Almost surely, 2^28731650 is an apocalyptic number.

28731650 is a deficient number, since it is larger than the sum of its proper divisors (24879874).

28731650 is a wasteful number, since it uses less digits than its factorization.

28731650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846 (or 1841 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 28731650 is about 5360.1912279321. The cubic root of 28731650 is about 306.2810936082.

The spelling of 28731650 in words is "twenty-eight million, seven hundred thirty-one thousand, six hundred fifty".