28257930 has 32 divisors (see below), whose sum is σ = 75355200. Its totient is φ = 7535376.

The previous prime is 28257907. The next prime is 28257937. The reversal of 28257930 is 3975282.

It is a happy number.

28257930 is a `hidden beast` number, since 2 + 82 + 579 + 3 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (28257937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52060 + ... + 52599.

It is an arithmetic number, because the mean of its divisors is an integer number (2354850).

Almost surely, 2^28257930 is an apocalyptic number.

28257930 is an abundant number, since it is smaller than the sum of its proper divisors (47097270).

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

28257930 is a wasteful number, since it uses less digits than its factorization.

28257930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104675 (or 104669 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 28257930 is about 5315.8188456719. The cubic root of 28257930 is about 304.5884622494.

The spelling of 28257930 in words is "twenty-eight million, two hundred fifty-seven thousand, nine hundred thirty".