28328556 has 12 divisors (see below), whose sum is σ = 66099992. Its totient is φ = 9442848.

The previous prime is 28328551. The next prime is 28328591. The reversal of 28328556 is 65582382.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (28328551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1180345 + ... + 1180368.

Almost surely, 2^28328556 is an apocalyptic number.

It is an amenable number.

28328556 is an abundant number, since it is smaller than the sum of its proper divisors (37771436).

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

28328556 is a wasteful number, since it uses less digits than its factorization.

28328556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360720 (or 2360718 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The square root of 28328556 is about 5322.4577029790. The cubic root of 28328556 is about 304.8420072166.

The spelling of 28328556 in words is "twenty-eight million, three hundred twenty-eight thousand, five hundred fifty-six".