28040432 has 20 divisors (see below), whose sum is σ = 62089776. Its totient is φ = 12017280.

The previous prime is 28040431. The next prime is 28040437. The reversal of 28040432 is 23404082.

It is a junction number, because it is equal to n+sod(n) for n = 28040398 and 28040407.

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 3 ways as a sum of consecutive naturals, for example, 125069 + ... + 125292.

Almost surely, 2^28040432 is an apocalyptic number.

It is an amenable number.

28040432 is an abundant number, since it is smaller than the sum of its proper divisors (34049344).

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

28040432 is a wasteful number, since it uses less digits than its factorization.

28040432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250376 (or 250370 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 28040432 is about 5295.3217088294. The cubic root of 28040432 is about 303.8049880409.

The spelling of 28040432 in words is "twenty-eight million, forty thousand, four hundred thirty-two".