28040188 has 12 divisors (see below), whose sum is σ = 53531352. Its totient is φ = 12745520.

The previous prime is 28040113. The next prime is 28040189. The reversal of 28040188 is 88104082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28040189) 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, 318595 + ... + 318682.

It is an arithmetic number, because the mean of its divisors is an integer number (4460946).

Almost surely, 2^28040188 is an apocalyptic number.

It is an amenable number.

28040188 is a deficient number, since it is larger than the sum of its proper divisors (25491164).

28040188 is a wasteful number, since it uses less digits than its factorization.

28040188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637292 (or 637290 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 28040188 is about 5295.2986695747. The cubic root of 28040188 is about 303.8041068297.

The spelling of 28040188 in words is "twenty-eight million, forty thousand, one hundred eighty-eight".