28581634 has 8 divisors (see below), whose sum is σ = 43025868. Its totient is φ = 14239680.

The previous prime is 28581629. The next prime is 28581661. The reversal of 28581634 is 43618582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27531009 + 1050625 = 5247^2 + 1025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28581593 and 28581602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24867 + ... + 25990.

Almost surely, 2^28581634 is an apocalyptic number.

28581634 is a deficient number, since it is larger than the sum of its proper divisors (14444234).

28581634 is a wasteful number, since it uses less digits than its factorization.

28581634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51140.

The product of its digits is 46080, while the sum is 37.

The square root of 28581634 is about 5346.1793834476. The cubic root of 28581634 is about 305.7471033360.

The spelling of 28581634 in words is "twenty-eight million, five hundred eighty-one thousand, six hundred thirty-four".