28580409 has 48 divisors (see below), whose sum is σ = 49533120. Its totient is φ = 15649920.

The previous prime is 28580359. The next prime is 28580413. The reversal of 28580409 is 90408582.

It is not a de Polignac number, because 28580409 - 2⁹ = 28579897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28580429) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68002 + ... + 68420.

It is an arithmetic number, because the mean of its divisors is an integer number (1031940).

Almost surely, 2^28580409 is an apocalyptic number.

It is an amenable number.

28580409 is a deficient number, since it is larger than the sum of its proper divisors (20952711).

28580409 is a wasteful number, since it uses less digits than its factorization.

28580409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 499 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28580409 is about 5346.0648144219. The cubic root of 28580409 is about 305.7427351981.

The spelling of 28580409 in words is "twenty-eight million, five hundred eighty thousand, four hundred nine".