28341561 has 4 divisors (see below), whose sum is σ = 37788752. Its totient is φ = 18894372.

The previous prime is 28341541. The next prime is 28341563. The reversal of 28341561 is 16514382.

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 28341561 - 2⁵ = 28341529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28341563) 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, 4723591 + ... + 4723596.

It is an arithmetic number, because the mean of its divisors is an integer number (9447188).

Almost surely, 2^28341561 is an apocalyptic number.

It is an amenable number.

28341561 is a deficient number, since it is larger than the sum of its proper divisors (9447191).

28341561 is an equidigital number, since it uses as much as digits as its factorization.

28341561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9447190.

The product of its digits is 5760, while the sum is 30.

The square root of 28341561 is about 5323.6792728338. The cubic root of 28341561 is about 304.8886487726. Note that the first 3 decimals are identical.

The spelling of 28341561 in words is "twenty-eight million, three hundred forty-one thousand, five hundred sixty-one".