28028930 has 8 divisors (see below), whose sum is σ = 50452092. Its totient is φ = 11211568.

The previous prime is 28028921. The next prime is 28028969. The reversal of 28028930 is 3982082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25775929 + 2253001 = 5077^2 + 1501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1401437 + ... + 1401456.

Almost surely, 2^28028930 is an apocalyptic number.

28028930 is a deficient number, since it is larger than the sum of its proper divisors (22423162).

28028930 is a wasteful number, since it uses less digits than its factorization.

28028930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802900.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 28028930 is about 5294.2355444389. The cubic root of 28028930 is about 303.7634427600.

The spelling of 28028930 in words is "twenty-eight million, twenty-eight thousand, nine hundred thirty".