28085961 has 4 divisors (see below), whose sum is σ = 37447952. Its totient is φ = 18723972.

The previous prime is 28085957. The next prime is 28085963. The reversal of 28085961 is 16958082.

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 not a de Polignac number, because 28085961 - 2² = 28085957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28085963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4680991 + ... + 4680996.

It is an arithmetic number, because the mean of its divisors is an integer number (9361988).

Almost surely, 2^28085961 is an apocalyptic number.

It is an amenable number.

28085961 is a deficient number, since it is larger than the sum of its proper divisors (9361991).

28085961 is an equidigital number, since it uses as much as digits as its factorization.

28085961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9361990.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 28085961 is about 5299.6189485660. The cubic root of 28085961 is about 303.9693276129.

The spelling of 28085961 in words is "twenty-eight million, eighty-five thousand, nine hundred sixty-one".