28033530 has 32 divisors (see below), whose sum is σ = 76892544. Its totient is φ = 6407616.

The previous prime is 28033529. The next prime is 28033541. The reversal of 28033530 is 3533082.

It is a self number, because there is not a number n which added to its sum of digits gives 28033530.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66537 + ... + 66956.

It is an arithmetic number, because the mean of its divisors is an integer number (2402892).

Almost surely, 2^28033530 is an apocalyptic number.

28033530 is an abundant number, since it is smaller than the sum of its proper divisors (48859014).

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

28033530 is a wasteful number, since it uses less digits than its factorization.

28033530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133510.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 28033530 is about 5294.6699613857. The cubic root of 28033530 is about 303.7800593463.

The spelling of 28033530 in words is "twenty-eight million, thirty-three thousand, five hundred thirty".