28040436 has 36 divisors (see below), whose sum is σ = 71198400. Its totient is φ = 9304848.

The previous prime is 28040431. The next prime is 28040437. The reversal of 28040436 is 63404082.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 6975 + ... + 10233.

Almost surely, 2^28040436 is an apocalyptic number.

It is an amenable number.

28040436 is an abundant number, since it is smaller than the sum of its proper divisors (43157964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28040436 is a wasteful number, since it uses less digits than its factorization.

28040436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3508 (or 3503 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 28040436 is about 5295.3220865213. The cubic root of 28040436 is about 303.8050024869.

The spelling of 28040436 in words is "twenty-eight million, forty thousand, four hundred thirty-six".