28023660 has 144 divisors (see below), whose sum is σ = 101477376. Its totient is φ = 6120576.

The previous prime is 28023649. The next prime is 28023673. The reversal of 28023660 is 6632082.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28497 + ... + 29463.

It is an arithmetic number, because the mean of its divisors is an integer number (704704).

Almost surely, 2^28023660 is an apocalyptic number.

28023660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28023660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50738688).

28023660 is an abundant number, since it is smaller than the sum of its proper divisors (73453716).

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

28023660 is a wasteful number, since it uses less digits than its factorization.

28023660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012 (or 1007 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 28023660 is about 5293.7378099033. The cubic root of 28023660 is about 303.7444036971.

The spelling of 28023660 in words is "twenty-eight million, twenty-three thousand, six hundred sixty".