28064251 has 4 divisors (see below), whose sum is σ = 28716952. Its totient is φ = 27411552.

The previous prime is 28064249. The next prime is 28064287. The reversal of 28064251 is 15246082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28064251 - 2¹ = 28064249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28064291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326286 + ... + 326371.

It is an arithmetic number, because the mean of its divisors is an integer number (7179238).

Almost surely, 2^28064251 is an apocalyptic number.

28064251 is a deficient number, since it is larger than the sum of its proper divisors (652701).

28064251 is an equidigital number, since it uses as much as digits as its factorization.

28064251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652700.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 28064251 is about 5297.5702921245. The cubic root of 28064251 is about 303.8909862762.

The spelling of 28064251 in words is "twenty-eight million, sixty-four thousand, two hundred fifty-one".