28681594 has 4 divisors (see below), whose sum is σ = 43022394. Its totient is φ = 14340796.

The previous prime is 28681589. The next prime is 28681607. The reversal of 28681594 is 49518682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49518682 = 2 ⋅24759341.

It can be written as a sum of positive squares in only one way, i.e., 28483569 + 198025 = 5337^2 + 445^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28681594.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7170397 + ... + 7170400.

Almost surely, 2^28681594 is an apocalyptic number.

28681594 is a deficient number, since it is larger than the sum of its proper divisors (14340800).

28681594 is a wasteful number, since it uses less digits than its factorization.

28681594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14340799.

The product of its digits is 138240, while the sum is 43.

The square root of 28681594 is about 5355.5199560827. The cubic root of 28681594 is about 306.1031235723.

The spelling of 28681594 in words is "twenty-eight million, six hundred eighty-one thousand, five hundred ninety-four".