28195501 has 4 divisors (see below), whose sum is σ = 28274400. Its totient is φ = 28116604.

The previous prime is 28195477. The next prime is 28195507. The reversal of 28195501 is 10559182.

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 28195501 - 2¹¹ = 28193453 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 (28195507) 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, 38911 + ... + 39628.

It is an arithmetic number, because the mean of its divisors is an integer number (7068600).

Almost surely, 2^28195501 is an apocalyptic number.

It is an amenable number.

28195501 is a deficient number, since it is larger than the sum of its proper divisors (78899).

28195501 is an equidigital number, since it uses as much as digits as its factorization.

28195501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78898.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 28195501 is about 5309.9435966873. The cubic root of 28195501 is about 304.3639922401.

The spelling of 28195501 in words is "twenty-eight million, one hundred ninety-five thousand, five hundred one".