28539966 has 64 divisors (see below), whose sum is σ = 70898688. Its totient is φ = 7458048.

The previous prime is 28539949. The next prime is 28539967. The reversal of 28539966 is 66993582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28539967) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91026 + ... + 91338.

It is an arithmetic number, because the mean of its divisors is an integer number (1107792).

Almost surely, 2^28539966 is an apocalyptic number.

28539966 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28539966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35449344).

28539966 is an abundant number, since it is smaller than the sum of its proper divisors (42358722).

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

28539966 is a wasteful number, since it uses less digits than its factorization.

28539966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505.

The product of its digits is 699840, while the sum is 48.

The square root of 28539966 is about 5342.2809735168. The cubic root of 28539966 is about 305.5984523258.

The spelling of 28539966 in words is "twenty-eight million, five hundred thirty-nine thousand, nine hundred sixty-six".