28195807 has 2 divisors, whose sum is σ = 28195808. Its totient is φ = 28195806.

The previous prime is 28195781. The next prime is 28195819. The reversal of 28195807 is 70859182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28195807 - 2⁷ = 28195679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28195807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28195507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14097903 + 14097904.

It is an arithmetic number, because the mean of its divisors is an integer number (14097904).

Almost surely, 2^28195807 is an apocalyptic number.

28195807 is a deficient number, since it is larger than the sum of its proper divisors (1).

28195807 is an equidigital number, since it uses as much as digits as its factorization.

28195807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28195807 is about 5309.9724104745. The cubic root of 28195807 is about 304.3650933028.

The spelling of 28195807 in words is "twenty-eight million, one hundred ninety-five thousand, eight hundred seven".