28109215528 has 32 divisors (see below), whose sum is σ = 54512064000. Its totient is φ = 13574450880.

The previous prime is 28109215523. The next prime is 28109215549. The reversal of 28109215528 is 82551290182.

It is not an unprimeable number, because it can be changed into a prime (28109215523) 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, 14893 + ... + 237571.

It is an arithmetic number, because the mean of its divisors is an integer number (1703502000).

Almost surely, 2^28109215528 is an apocalyptic number.

It is an amenable number.

28109215528 is a deficient number, since it is larger than the sum of its proper divisors (26402848472).

28109215528 is a wasteful number, since it uses less digits than its factorization.

28109215528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223225 (or 223221 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 28109215528 in words is "twenty-eight billion, one hundred nine million, two hundred fifteen thousand, five hundred twenty-eight".