28231320 has 64 divisors (see below), whose sum is σ = 91213920. Its totient is φ = 6948864.

The previous prime is 28231289. The next prime is 28231387. The reversal of 28231320 is 2313282.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7489 + ... + 10608.

Almost surely, 2^28231320 is an apocalyptic number.

28231320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28231320 is an abundant number, since it is smaller than the sum of its proper divisors (62982600).

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

28231320 is a wasteful number, since it uses less digits than its factorization.

28231320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18124 (or 18120 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 28231320 is about 5313.3153491958. The cubic root of 28231320 is about 304.4928236746.

The spelling of 28231320 in words is "twenty-eight million, two hundred thirty-one thousand, three hundred twenty".