28323988 has 24 divisors (see below), whose sum is σ = 61798464. Its totient is φ = 11035200.

The previous prime is 28323979. The next prime is 28324013. The reversal of 28323988 is 88932382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45673 + ... + 46288.

It is an arithmetic number, because the mean of its divisors is an integer number (2574936).

Almost surely, 2^28323988 is an apocalyptic number.

28323988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28323988 is an abundant number, since it is smaller than the sum of its proper divisors (33474476).

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

28323988 is a wasteful number, since it uses less digits than its factorization.

28323988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91983 (or 91981 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 28323988 is about 5322.0285606148. The cubic root of 28323988 is about 304.8256210049.

The spelling of 28323988 in words is "twenty-eight million, three hundred twenty-three thousand, nine hundred eighty-eight".