28672409 has 4 divisors (see below), whose sum is σ = 28898304. Its totient is φ = 28446516.

The previous prime is 28672393. The next prime is 28672411. The reversal of 28672409 is 90427682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28672409 - 2⁴ = 28672393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28672499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112757 + ... + 113010.

It is an arithmetic number, because the mean of its divisors is an integer number (7224576).

Almost surely, 2^28672409 is an apocalyptic number.

It is an amenable number.

28672409 is a deficient number, since it is larger than the sum of its proper divisors (225895).

28672409 is a wasteful number, since it uses less digits than its factorization.

28672409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225894.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 28672409 is about 5354.6623609710. The cubic root of 28672409 is about 306.0704445731.

The spelling of 28672409 in words is "twenty-eight million, six hundred seventy-two thousand, four hundred nine".