28945251 has 6 divisors (see below), whose sum is σ = 41809820. Its totient is φ = 19296828.

The previous prime is 28945249. The next prime is 28945253. The reversal of 28945251 is 15254982.

It is an interprime number because it is at equal distance from previous prime (28945249) and next prime (28945253).

It is not a de Polignac number, because 28945251 - 2¹ = 28945249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28945253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1608061 + ... + 1608078.

Almost surely, 2^28945251 is an apocalyptic number.

28945251 is a deficient number, since it is larger than the sum of its proper divisors (12864569).

28945251 is a wasteful number, since it uses less digits than its factorization.

28945251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216145 (or 3216142 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 28945251 is about 5380.0790886380. The cubic root of 28945251 is about 307.0382202271.

The spelling of 28945251 in words is "twenty-eight million, nine hundred forty-five thousand, two hundred fifty-one".