28195951 has 4 divisors (see below), whose sum is σ = 32223952. Its totient is φ = 24167952.

The previous prime is 28195939. The next prime is 28195963. The reversal of 28195951 is 15959182.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28195939) and next prime (28195963).

It is a cyclic number.

It is not a de Polignac number, because 28195951 - 2⁹ = 28195439 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 (28195051) 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, 2013990 + ... + 2014003.

It is an arithmetic number, because the mean of its divisors is an integer number (8055988).

Almost surely, 2^28195951 is an apocalyptic number.

28195951 is a deficient number, since it is larger than the sum of its proper divisors (4028001).

28195951 is an equidigital number, since it uses as much as digits as its factorization.

28195951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028000.

The product of its digits is 32400, while the sum is 40.

The square root of 28195951 is about 5309.9859698496. The cubic root of 28195951 is about 304.3656114472.

The spelling of 28195951 in words is "twenty-eight million, one hundred ninety-five thousand, nine hundred fifty-one".