28001330 has 32 divisors (see below), whose sum is σ = 57822336. Its totient is φ = 9563904.

The previous prime is 28001321. The next prime is 28001353. The reversal of 28001330 is 3310082.

It is a junction number, because it is equal to n+sod(n) for n = 28001299 and 28001308.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22997 + ... + 24183.

It is an arithmetic number, because the mean of its divisors is an integer number (1806948).

Almost surely, 2^28001330 is an apocalyptic number.

28001330 is an abundant number, since it is smaller than the sum of its proper divisors (29821006).

28001330 is a wasteful number, since it uses less digits than its factorization.

28001330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 28001330 is about 5291.6282938241. The cubic root of 28001330 is about 303.6637050440.

The spelling of 28001330 in words is "twenty-eight million, one thousand, three hundred thirty".