28075247 has 4 divisors (see below), whose sum is σ = 28090176. Its totient is φ = 28060320.

The previous prime is 28075241. The next prime is 28075253. The reversal of 28075247 is 74257082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74257082 = 2 ⋅37128541.

It is an interprime number because it is at equal distance from previous prime (28075241) and next prime (28075253).

It is a cyclic number.

It is not a de Polignac number, because 28075247 - 2⁴ = 28075231 is a prime.

It is a super-2 number, since 2×28075247² = 1576438988222018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28075241) 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, 4154 + ... + 8567.

It is an arithmetic number, because the mean of its divisors is an integer number (7022544).

Almost surely, 2^28075247 is an apocalyptic number.

28075247 is a deficient number, since it is larger than the sum of its proper divisors (14929).

28075247 is a wasteful number, since it uses less digits than its factorization.

28075247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14928.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 28075247 is about 5298.6080247552. The cubic root of 28075247 is about 303.9306707957.

The spelling of 28075247 in words is "twenty-eight million, seventy-five thousand, two hundred forty-seven".