28628409 has 8 divisors (see below), whose sum is σ = 38210400. Its totient is φ = 19066016.

The previous prime is 28628389. The next prime is 28628419. The reversal of 28628409 is 90482682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28628409 - 2¹³ = 28620217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28628419) 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, 1059 + ... + 7640.

It is an arithmetic number, because the mean of its divisors is an integer number (4776300).

Almost surely, 2^28628409 is an apocalyptic number.

It is an amenable number.

28628409 is a deficient number, since it is larger than the sum of its proper divisors (9581991).

28628409 is a wasteful number, since it uses less digits than its factorization.

28628409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9799.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 28628409 is about 5350.5522144915. The cubic root of 28628409 is about 305.9138015996.

The spelling of 28628409 in words is "twenty-eight million, six hundred twenty-eight thousand, four hundred nine".