28355330 has 16 divisors (see below), whose sum is σ = 52800120. Its totient is φ = 10950912.

The previous prime is 28355309. The next prime is 28355339. The reversal of 28355330 is 3355382.

It can be written as a sum of positive squares in 4 ways, for example, as 19811401 + 8543929 = 4451^2 + 2923^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 28355293 and 28355302.

It is not an unprimeable number, because it can be changed into a prime (28355339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48599 + ... + 49178.

Almost surely, 2^28355330 is an apocalyptic number.

28355330 is a deficient number, since it is larger than the sum of its proper divisors (24444790).

28355330 is a wasteful number, since it uses less digits than its factorization.

28355330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97813.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 28355330 is about 5324.9723003974. The cubic root of 28355330 is about 304.9380148156.

The spelling of 28355330 in words is "twenty-eight million, three hundred fifty-five thousand, three hundred thirty".