28658247 has 8 divisors (see below), whose sum is σ = 38858880. Its totient is φ = 18781560.

The previous prime is 28658237. The next prime is 28658249. The reversal of 28658247 is 74285682.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28658247 - 2²⁰ = 27609671 is a prime.

It is a super-2 number, since 2×28658247² = 1642590242226018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28658199 and 28658208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28658249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80779 + ... + 81132.

It is an arithmetic number, because the mean of its divisors is an integer number (4857360).

Almost surely, 2^28658247 is an apocalyptic number.

28658247 is a deficient number, since it is larger than the sum of its proper divisors (10200633).

28658247 is a wasteful number, since it uses less digits than its factorization.

28658247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161973.

The product of its digits is 215040, while the sum is 42.

The square root of 28658247 is about 5353.3397986677. The cubic root of 28658247 is about 306.0200443959.

The spelling of 28658247 in words is "twenty-eight million, six hundred fifty-eight thousand, two hundred forty-seven".