28722250 has 16 divisors (see below), whose sum is σ = 53768520. Its totient is φ = 11488800.

The previous prime is 28722247. The next prime is 28722251. The reversal of 28722250 is 5222782.

It can be written as a sum of positive squares in 4 ways, for example, as 9247681 + 19474569 = 3041^2 + 4413^2 .

It is not an unprimeable number, because it can be changed into a prime (28722251) 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 7 ways as a sum of consecutive naturals, for example, 57195 + ... + 57694.

Almost surely, 2^28722250 is an apocalyptic number.

28722250 is a deficient number, since it is larger than the sum of its proper divisors (25046270).

28722250 is a wasteful number, since it uses less digits than its factorization.

28722250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114906 (or 114896 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 28722250 is about 5359.3143218139. The cubic root of 28722250 is about 306.2476884457.

The spelling of 28722250 in words is "twenty-eight million, seven hundred twenty-two thousand, two hundred fifty".