28621859 has 8 divisors (see below), whose sum is σ = 32766720. Its totient is φ = 24491016.

The previous prime is 28621849. The next prime is 28621861. The reversal of 28621859 is 95812682.

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 28621859 - 2⁴ = 28621843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28621819) 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, 1322 + ... + 7680.

It is an arithmetic number, because the mean of its divisors is an integer number (4095840).

Almost surely, 2^28621859 is an apocalyptic number.

28621859 is a deficient number, since it is larger than the sum of its proper divisors (4144861).

28621859 is an equidigital number, since it uses as much as digits as its factorization.

28621859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7009.

The product of its digits is 69120, while the sum is 41.

The square root of 28621859 is about 5349.9400931225. The cubic root of 28621859 is about 305.8904694353.

The spelling of 28621859 in words is "twenty-eight million, six hundred twenty-one thousand, eight hundred fifty-nine".