28370817 has 10 divisors (see below), whose sum is σ = 42381218. Its totient is φ = 18913824.

The previous prime is 28370777. The next prime is 28370827. The reversal of 28370817 is 71807382.

It can be written as a sum of positive squares in only one way, i.e., 24591681 + 3779136 = 4959^2 + 1944^2 .

It is not a de Polignac number, because 28370817 - 2¹² = 28366721 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 (28370827) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 175048 + ... + 175209.

Almost surely, 2^28370817 is an apocalyptic number.

28370817 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28370817 is a deficient number, since it is larger than the sum of its proper divisors (14010401).

28370817 is an equidigital number, since it uses as much as digits as its factorization.

28370817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350269 (or 350260 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 28370817 is about 5326.4262878594. The cubic root of 28370817 is about 304.9935213172.

The spelling of 28370817 in words is "twenty-eight million, three hundred seventy thousand, eight hundred seventeen".