28115928 has 24 divisors (see below), whose sum is σ = 76147500. Its totient is φ = 9371952.

The previous prime is 28115897. The next prime is 28115939. The reversal of 28115928 is 82951182.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28115892 and 28115901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 195178 + ... + 195321.

Almost surely, 2^28115928 is an apocalyptic number.

It is an amenable number.

28115928 is an abundant number, since it is smaller than the sum of its proper divisors (48031572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28115928 is a wasteful number, since it uses less digits than its factorization.

28115928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390511 (or 390504 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 28115928 is about 5302.4454735527. The cubic root of 28115928 is about 304.0773983444.

The spelling of 28115928 in words is "twenty-eight million, one hundred fifteen thousand, nine hundred twenty-eight".