28130049 has 6 divisors (see below), whose sum is σ = 40632306. Its totient is φ = 18753360.

The previous prime is 28130033. The next prime is 28130093. The reversal of 28130049 is 94003182.

It can be written as a sum of positive squares in only one way, i.e., 27751824 + 378225 = 5268^2 + 615^2 .

It is not a de Polignac number, because 28130049 - 2⁴ = 28130033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28130009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1562772 + ... + 1562789.

It is an arithmetic number, because the mean of its divisors is an integer number (6772051).

Almost surely, 2^28130049 is an apocalyptic number.

It is an amenable number.

28130049 is a deficient number, since it is larger than the sum of its proper divisors (12502257).

28130049 is a wasteful number, since it uses less digits than its factorization.

28130049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125567 (or 3125564 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28130049 is about 5303.7768618221. The cubic root of 28130049 is about 304.1282966382.

The spelling of 28130049 in words is "twenty-eight million, one hundred thirty thousand, forty-nine".