28881136 has 40 divisors (see below), whose sum is σ = 57625280. Its totient is φ = 14017536.

The previous prime is 28881133. The next prime is 28881137. The reversal of 28881136 is 63118882.

It is a junction number, because it is equal to n+sod(n) for n = 28881095 and 28881104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28881133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92116 + ... + 92428.

It is an arithmetic number, because the mean of its divisors is an integer number (1440632).

Almost surely, 2^28881136 is an apocalyptic number.

It is an amenable number.

28881136 is a deficient number, since it is larger than the sum of its proper divisors (28744144).

28881136 is a wasteful number, since it uses less digits than its factorization.

28881136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 467 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 28881136 is about 5374.1172298341. The cubic root of 28881136 is about 306.8113515969.

The spelling of 28881136 in words is "twenty-eight million, eight hundred eighty-one thousand, one hundred thirty-six".