28195777 has 4 divisors (see below), whose sum is σ = 28382656. Its totient is φ = 28008900.

The previous prime is 28195763. The next prime is 28195781. The reversal of 28195777 is 77759182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28195777 - 2⁷ = 28195649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28195477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93213 + ... + 93514.

It is an arithmetic number, because the mean of its divisors is an integer number (7095664).

Almost surely, 2^28195777 is an apocalyptic number.

It is an amenable number.

28195777 is a deficient number, since it is larger than the sum of its proper divisors (186879).

28195777 is a wasteful number, since it uses less digits than its factorization.

28195777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186878.

The product of its digits is 246960, while the sum is 46.

The square root of 28195777 is about 5309.9695856003. The cubic root of 28195777 is about 304.3649853558.

The spelling of 28195777 in words is "twenty-eight million, one hundred ninety-five thousand, seven hundred seventy-seven".