28434617 has 4 divisors (see below), whose sum is σ = 28489716. Its totient is φ = 28379520.

The previous prime is 28434613. The next prime is 28434619. The reversal of 28434617 is 71643482.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11162281 + 17272336 = 3341^2 + 4156^2 .

It is a cyclic number.

It is not a de Polignac number, because 28434617 - 2² = 28434613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28434613) 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, 26768 + ... + 27809.

It is an arithmetic number, because the mean of its divisors is an integer number (7122429).

Almost surely, 2^28434617 is an apocalyptic number.

It is an amenable number.

28434617 is a deficient number, since it is larger than the sum of its proper divisors (55099).

28434617 is an equidigital number, since it uses as much as digits as its factorization.

28434617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55098.

The product of its digits is 32256, while the sum is 35.

The square root of 28434617 is about 5332.4119308245. The cubic root of 28434617 is about 305.2219722493.

The spelling of 28434617 in words is "twenty-eight million, four hundred thirty-four thousand, six hundred seventeen".