28011330 has 24 divisors (see below), whose sum is σ = 72829692. Its totient is φ = 7469664.

The previous prime is 28011329. The next prime is 28011343. The reversal of 28011330 is 3311082.

It can be written as a sum of positive squares in 2 ways, for example, as 26718561 + 1292769 = 5169^2 + 1137^2 .

It is a super-3 number, since 3×28011330³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 155529 + ... + 155708.

Almost surely, 2^28011330 is an apocalyptic number.

28011330 is an abundant number, since it is smaller than the sum of its proper divisors (44818362).

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

28011330 is a wasteful number, since it uses less digits than its factorization.

28011330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311250 (or 311247 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 28011330 is about 5292.5730982198. The cubic root of 28011330 is about 303.6998494656.

The spelling of 28011330 in words is "twenty-eight million, eleven thousand, three hundred thirty".