28031384 has 16 divisors (see below), whose sum is σ = 55325400. Its totient is φ = 13277952.

The previous prime is 28031369. The next prime is 28031389. The reversal of 28031384 is 48313082.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28031389) 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, 92057 + ... + 92360.

Almost surely, 2^28031384 is an apocalyptic number.

It is an amenable number.

28031384 is a deficient number, since it is larger than the sum of its proper divisors (27294016).

28031384 is a wasteful number, since it uses less digits than its factorization.

28031384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184442 (or 184438 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28031384 is about 5294.4673008717. The cubic root of 28031384 is about 303.7723075738.

The spelling of 28031384 in words is "twenty-eight million, thirty-one thousand, three hundred eighty-four".