28956251 has 2 divisors, whose sum is σ = 28956252. Its totient is φ = 28956250.

The previous prime is 28956229. The next prime is 28956271. The reversal of 28956251 is 15265982.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28956251 is a prime.

It is not a weakly prime, because it can be changed into another prime (28956271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14478125 + 14478126.

It is an arithmetic number, because the mean of its divisors is an integer number (14478126).

Almost surely, 2^28956251 is an apocalyptic number.

28956251 is a deficient number, since it is larger than the sum of its proper divisors (1).

28956251 is an equidigital number, since it uses as much as digits as its factorization.

28956251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 38.

The square root of 28956251 is about 5381.1012813364. The cubic root of 28956251 is about 307.0771096541.

The spelling of 28956251 in words is "twenty-eight million, nine hundred fifty-six thousand, two hundred fifty-one".