28040434 has 8 divisors (see below), whose sum is σ = 42114348. Its totient is φ = 14002320.

The previous prime is 28040431. The next prime is 28040437. The reversal of 28040434 is 43404082.

It is an interprime number because it is at equal distance from previous prime (28040431) and next prime (28040437).

It can be written as a sum of positive squares in 2 ways, for example, as 27405225 + 635209 = 5235^2 + 797^2 .

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 = 28040399 and 28040408.

It is not an unprimeable number, because it can be changed into a prime (28040431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6897 + ... + 10180.

Almost surely, 2^28040434 is an apocalyptic number.

28040434 is a deficient number, since it is larger than the sum of its proper divisors (14073914).

28040434 is a wasteful number, since it uses less digits than its factorization.

28040434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17900.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 28040434 is about 5295.3218976753. The cubic root of 28040434 is about 303.8049952639.

The spelling of 28040434 in words is "twenty-eight million, forty thousand, four hundred thirty-four".