28001930 has 32 divisors (see below), whose sum is σ = 55244160. Its totient is φ = 10134720.

The previous prime is 28001927. The next prime is 28001951. The reversal of 28001930 is 3910082.

It is a junction number, because it is equal to n+sod(n) for n = 28001896 and 28001905.

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, 30011 + ... + 30929.

It is an arithmetic number, because the mean of its divisors is an integer number (1726380).

Almost surely, 2^28001930 is an apocalyptic number.

28001930 is a deficient number, since it is larger than the sum of its proper divisors (27242230).

28001930 is a wasteful number, since it uses less digits than its factorization.

28001930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 28001930 is about 5291.6849868449. The cubic root of 28001930 is about 303.6658739519.

The spelling of 28001930 in words is "twenty-eight million, one thousand, nine hundred thirty".