28578865 has 8 divisors (see below), whose sum is σ = 39193920. Its totient is φ = 19596912.

The previous prime is 28578863. The next prime is 28578881. The reversal of 28578865 is 56887582.

It is a happy number.

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 28578865 - 2¹ = 28578863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28578863) 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, 408235 + ... + 408304.

It is an arithmetic number, because the mean of its divisors is an integer number (4899240).

Almost surely, 2^28578865 is an apocalyptic number.

It is an amenable number.

28578865 is a deficient number, since it is larger than the sum of its proper divisors (10615055).

28578865 is an equidigital number, since it uses as much as digits as its factorization.

28578865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816551.

The product of its digits is 1075200, while the sum is 49.

The square root of 28578865 is about 5345.9204071890. The cubic root of 28578865 is about 305.7372293837.

The spelling of 28578865 in words is "twenty-eight million, five hundred seventy-eight thousand, eight hundred sixty-five".