28407609 has 6 divisors (see below), whose sum is σ = 41033226. Its totient is φ = 18938400.

The previous prime is 28407607. The next prime is 28407611. The reversal of 28407609 is 90670482.

28407609 is a `hidden beast` number, since 2 + 8 + 40 + 7 + 609 = 666.

It is an interprime number because it is at equal distance from previous prime (28407607) and next prime (28407611).

It can be written as a sum of positive squares in only one way, i.e., 28355625 + 51984 = 5325^2 + 228^2 .

It is not a de Polignac number, because 28407609 - 2¹ = 28407607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28407607) 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, 1578192 + ... + 1578209.

It is an arithmetic number, because the mean of its divisors is an integer number (6838871).

Almost surely, 2^28407609 is an apocalyptic number.

It is an amenable number.

28407609 is a deficient number, since it is larger than the sum of its proper divisors (12625617).

28407609 is a wasteful number, since it uses less digits than its factorization.

28407609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3156407 (or 3156404 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 28407609 is about 5329.8788916822. The cubic root of 28407609 is about 305.1253054956.

The spelling of 28407609 in words is "twenty-eight million, four hundred seven thousand, six hundred nine".