28023247 has 6 divisors (see below), whose sum is σ = 32598528. Its totient is φ = 24019884.

The previous prime is 28023241. The next prime is 28023253. The reversal of 28023247 is 74232082.

It is an interprime number because it is at equal distance from previous prime (28023241) and next prime (28023253).

It is a de Polignac number, because none of the positive numbers 2^k-28023247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28023241) 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, 285903 + ... + 286000.

It is an arithmetic number, because the mean of its divisors is an integer number (5433088).

Almost surely, 2^28023247 is an apocalyptic number.

28023247 is a deficient number, since it is larger than the sum of its proper divisors (4575281).

28023247 is an equidigital number, since it uses as much as digits as its factorization.

28023247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571917 (or 571910 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 28023247 is about 5293.6988014053. The cubic root of 28023247 is about 303.7429115407.

The spelling of 28023247 in words is "twenty-eight million, twenty-three thousand, two hundred forty-seven".