28624561 has 8 divisors (see below), whose sum is σ = 32785920. Its totient is φ = 24481248.

The previous prime is 28624553. The next prime is 28624579. The reversal of 28624561 is 16542682.

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 28624561 - 2³ = 28624553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28624591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 916 + ... + 7621.

It is an arithmetic number, because the mean of its divisors is an integer number (4098240).

Almost surely, 2^28624561 is an apocalyptic number.

It is an amenable number.

28624561 is a deficient number, since it is larger than the sum of its proper divisors (4161359).

28624561 is an equidigital number, since it uses as much as digits as its factorization.

28624561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9023.

The product of its digits is 23040, while the sum is 34.

The square root of 28624561 is about 5350.1926133551. The cubic root of 28624561 is about 305.9000948296.

The spelling of 28624561 in words is "twenty-eight million, six hundred twenty-four thousand, five hundred sixty-one".