28409530 has 16 divisors (see below), whose sum is σ = 51976584. Its totient is φ = 11177280.

The previous prime is 28409509. The next prime is 28409569. The reversal of 28409530 is 3590482.

It can be written as a sum of positive squares in 4 ways, for example, as 5340721 + 23068809 = 2311^2 + 4803^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28409492 and 28409501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22677 + ... + 23896.

Almost surely, 2^28409530 is an apocalyptic number.

28409530 is a deficient number, since it is larger than the sum of its proper divisors (23567054).

28409530 is a wasteful number, since it uses less digits than its factorization.

28409530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46641.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28409530 is about 5330.0590991095. The cubic root of 28409530 is about 305.1321831424.

The spelling of 28409530 in words is "twenty-eight million, four hundred nine thousand, five hundred thirty".