28355247 has 12 divisors (see below), whose sum is σ = 41030704. Its totient is φ = 18869760.

The previous prime is 28355237. The next prime is 28355263. The reversal of 28355247 is 74255382.

It is not a de Polignac number, because 28355247 - 2¹⁰ = 28354223 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 (28355227) 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, 3183 + ... + 8175.

Almost surely, 2^28355247 is an apocalyptic number.

28355247 is a deficient number, since it is larger than the sum of its proper divisors (12675457).

28355247 is a wasteful number, since it uses less digits than its factorization.

28355247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5630 (or 5627 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 28355247 is about 5324.9645069240. The cubic root of 28355247 is about 304.9377172833.

The spelling of 28355247 in words is "twenty-eight million, three hundred fifty-five thousand, two hundred forty-seven".