28066920 has 64 divisors (see below), whose sum is σ = 96232320. Its totient is φ = 6415104.

The previous prime is 28066891. The next prime is 28066921. The reversal of 28066920 is 2966082.

It is not an unprimeable number, because it can be changed into a prime (28066921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15867 + ... + 17546.

It is an arithmetic number, because the mean of its divisors is an integer number (1503630).

Almost surely, 2^28066920 is an apocalyptic number.

28066920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28066920 is an abundant number, since it is smaller than the sum of its proper divisors (68165400).

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

28066920 is a wasteful number, since it uses less digits than its factorization.

28066920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33434 (or 33430 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 28066920 is about 5297.8221940718. The cubic root of 28066920 is about 303.9006196389.

The spelling of 28066920 in words is "twenty-eight million, sixty-six thousand, nine hundred twenty".