28438856 has 32 divisors (see below), whose sum is σ = 56125440. Its totient is φ = 13483008.

The previous prime is 28438853. The next prime is 28438889. The reversal of 28438856 is 65883482.

It is not an unprimeable number, because it can be changed into a prime (28438853) 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, 22760 + ... + 23976.

It is an arithmetic number, because the mean of its divisors is an integer number (1753920).

Almost surely, 2^28438856 is an apocalyptic number.

It is an amenable number.

28438856 is a deficient number, since it is larger than the sum of its proper divisors (27686584).

28438856 is a wasteful number, since it uses less digits than its factorization.

28438856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373 (or 1369 counting only the distinct ones).

The product of its digits is 368640, while the sum is 44.

The square root of 28438856 is about 5332.8093909308. The cubic root of 28438856 is about 305.2371388759.

The spelling of 28438856 in words is "twenty-eight million, four hundred thirty-eight thousand, eight hundred fifty-six".