28371247 has 4 divisors (see below), whose sum is σ = 28646800. Its totient is φ = 28095696.

The previous prime is 28371241. The next prime is 28371263. The reversal of 28371247 is 74217382.

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 28371247 - 2²³ = 19982639 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 (28371241) 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, 137622 + ... + 137827.

It is an arithmetic number, because the mean of its divisors is an integer number (7161700).

Almost surely, 2^28371247 is an apocalyptic number.

28371247 is a deficient number, since it is larger than the sum of its proper divisors (275553).

28371247 is a wasteful number, since it uses less digits than its factorization.

28371247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275552.

The product of its digits is 18816, while the sum is 34.

The square root of 28371247 is about 5326.4666524817. The cubic root of 28371247 is about 304.9950621793.

The spelling of 28371247 in words is "twenty-eight million, three hundred seventy-one thousand, two hundred forty-seven".