28040834 has 4 divisors (see below), whose sum is σ = 42061254. Its totient is φ = 14020416.

The previous prime is 28040809. The next prime is 28040839. The reversal of 28040834 is 43804082.

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

It can be written as a sum of positive squares in only one way, i.e., 23980609 + 4060225 = 4897^2 + 2015^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28040797 and 28040806.

It is not an unprimeable number, because it can be changed into a prime (28040839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7010207 + ... + 7010210.

Almost surely, 2^28040834 is an apocalyptic number.

28040834 is a deficient number, since it is larger than the sum of its proper divisors (14020420).

28040834 is a wasteful number, since it uses less digits than its factorization.

28040834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14020419.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 28040834 is about 5295.3596667271. The cubic root of 28040834 is about 303.8064398614.

It can be divided in two parts, 280 and 40834, that added together give a palindrome (41114).

The spelling of 28040834 in words is "twenty-eight million, forty thousand, eight hundred thirty-four".