28138832 has 20 divisors (see below), whose sum is σ = 54850656. Its totient is φ = 13983840.

The previous prime is 28138819. The next prime is 28138837. The reversal of 28138832 is 23883182.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28138792 and 28138801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28138837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2594 + ... + 7937.

Almost surely, 2^28138832 is an apocalyptic number.

It is an amenable number.

28138832 is a deficient number, since it is larger than the sum of its proper divisors (26711824).

28138832 is a wasteful number, since it uses less digits than its factorization.

28138832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10706 (or 10700 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 28138832 is about 5304.6047920651. The cubic root of 28138832 is about 304.1599458409.

The spelling of 28138832 in words is "twenty-eight million, one hundred thirty-eight thousand, eight hundred thirty-two".