28687409 has 8 divisors (see below), whose sum is σ = 29808000. Its totient is φ = 27575632.

The previous prime is 28687387. The next prime is 28687411. The reversal of 28687409 is 90478682.

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 28687409 - 2²⁰ = 27638833 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28687409.

It is not an unprimeable number, because it can be changed into a prime (28687429) 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, 4862 + ... + 9000.

It is an arithmetic number, because the mean of its divisors is an integer number (3726000).

Almost surely, 2^28687409 is an apocalyptic number.

28687409 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28687409 is a deficient number, since it is larger than the sum of its proper divisors (1120591).

28687409 is a wasteful number, since it uses less digits than its factorization.

28687409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4407.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 28687409 is about 5356.0628263679. The cubic root of 28687409 is about 306.1238089566.

The spelling of 28687409 in words is "twenty-eight million, six hundred eighty-seven thousand, four hundred nine".