28636834 has 4 divisors (see below), whose sum is σ = 42955254. Its totient is φ = 14318416.

The previous prime is 28636813. The next prime is 28636837. The reversal of 28636834 is 43863682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43863682 = 2 ⋅21931841.

It can be written as a sum of positive squares in only one way, i.e., 19316025 + 9320809 = 4395^2 + 3053^2 .

It is not an unprimeable number, because it can be changed into a prime (28636837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7159207 + ... + 7159210.

Almost surely, 2^28636834 is an apocalyptic number.

28636834 is a deficient number, since it is larger than the sum of its proper divisors (14318420).

28636834 is a wasteful number, since it uses less digits than its factorization.

28636834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14318419.

The product of its digits is 165888, while the sum is 40.

The square root of 28636834 is about 5351.3394584907. The cubic root of 28636834 is about 305.9438075865.

The spelling of 28636834 in words is "twenty-eight million, six hundred thirty-six thousand, eight hundred thirty-four".