28280817 has 6 divisors (see below), whose sum is σ = 40850082. Its totient is φ = 18853872.

The previous prime is 28280803. The next prime is 28280831. The reversal of 28280817 is 71808282.

It is an interprime number because it is at equal distance from previous prime (28280803) and next prime (28280831).

It can be written as a sum of positive squares in only one way, i.e., 24443136 + 3837681 = 4944^2 + 1959^2 .

It is not a de Polignac number, because 28280817 - 2⁶ = 28280753 is a prime.

It is a super-2 number, since 2×28280817² = 1599609220374978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28280867) 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, 1571148 + ... + 1571165.

It is an arithmetic number, because the mean of its divisors is an integer number (6808347).

Almost surely, 2^28280817 is an apocalyptic number.

It is an amenable number.

28280817 is a deficient number, since it is larger than the sum of its proper divisors (12569265).

28280817 is a wasteful number, since it uses less digits than its factorization.

28280817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142319 (or 3142316 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28280817 is about 5317.9711356870. The cubic root of 28280817 is about 304.6706720331.

The spelling of 28280817 in words is "twenty-eight million, two hundred eighty thousand, eight hundred seventeen".