28486409 has 4 divisors (see below), whose sum is σ = 32555904. Its totient is φ = 24416916.

The previous prime is 28486379. The next prime is 28486421. The reversal of 28486409 is 90468482.

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 28486409 - 2⁸ = 28486153 is a prime.

It is a super-2 number, since 2×28486409² = 1622950995430562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28486429) 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, 2034737 + ... + 2034750.

It is an arithmetic number, because the mean of its divisors is an integer number (8138976).

Almost surely, 2^28486409 is an apocalyptic number.

It is an amenable number.

28486409 is a deficient number, since it is larger than the sum of its proper divisors (4069495).

28486409 is an equidigital number, since it uses as much as digits as its factorization.

28486409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069494.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 28486409 is about 5337.2660604471. The cubic root of 28486409 is about 305.4071745360.

The spelling of 28486409 in words is "twenty-eight million, four hundred eighty-six thousand, four hundred nine".