28993251 has 12 divisors (see below), whose sum is σ = 44969352. Its totient is φ = 16567488.

The previous prime is 28993241. The next prime is 28993267. The reversal of 28993251 is 15239982.

It is not a de Polignac number, because 28993251 - 2⁹ = 28992739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28993241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98470 + ... + 98763.

It is an arithmetic number, because the mean of its divisors is an integer number (3747446).

Almost surely, 2^28993251 is an apocalyptic number.

28993251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28993251 is a deficient number, since it is larger than the sum of its proper divisors (15976101).

28993251 is a wasteful number, since it uses less digits than its factorization.

28993251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197250 (or 197243 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 28993251 is about 5384.5381417537. The cubic root of 28993251 is about 307.2078473100.

The spelling of 28993251 in words is "twenty-eight million, nine hundred ninety-three thousand, two hundred fifty-one".