28195237 has 12 divisors (see below), whose sum is σ = 33339756. Its totient is φ = 23768640.

The previous prime is 28195201. The next prime is 28195247. The reversal of 28195237 is 73259182.

It can be written as a sum of positive squares in 2 ways, for example, as 8561476 + 19633761 = 2926^2 + 4431^2 .

It is not a de Polignac number, because 28195237 - 2¹¹ = 28193189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28195196 and 28195205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28195247) 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, 1728 + ... + 7705.

It is an arithmetic number, because the mean of its divisors is an integer number (2778313).

Almost surely, 2^28195237 is an apocalyptic number.

It is an amenable number.

28195237 is a deficient number, since it is larger than the sum of its proper divisors (5144519).

28195237 is an equidigital number, since it uses as much as digits as its factorization.

28195237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9508 (or 9501 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 28195237 is about 5309.9187376079. The cubic root of 28195237 is about 304.3630422972.

The spelling of 28195237 in words is "twenty-eight million, one hundred ninety-five thousand, two hundred thirty-seven".