28071330 has 32 divisors (see below), whose sum is σ = 76996224. Its totient is φ = 6416256.

The previous prime is 28071319. The next prime is 28071349. The reversal of 28071330 is 3317082.

It is a self number, because there is not a number n which added to its sum of digits gives 28071330.

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, 66627 + ... + 67046.

It is an arithmetic number, because the mean of its divisors is an integer number (2406132).

Almost surely, 2^28071330 is an apocalyptic number.

28071330 is an abundant number, since it is smaller than the sum of its proper divisors (48924894).

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

28071330 is a wasteful number, since it uses less digits than its factorization.

28071330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133690.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 28071330 is about 5298.2383864828. The cubic root of 28071330 is about 303.9165355469.

The spelling of 28071330 in words is "twenty-eight million, seventy-one thousand, three hundred thirty".