28220759 has 4 divisors (see below), whose sum is σ = 32252304. Its totient is φ = 24189216.

The previous prime is 28220737. The next prime is 28220761. The reversal of 28220759 is 95702282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28220759 - 2⁸ = 28220503 is a prime.

It is a super-2 number, since 2×28220759² = 1592822477072162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28220779) 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, 2015762 + ... + 2015775.

It is an arithmetic number, because the mean of its divisors is an integer number (8063076).

Almost surely, 2^28220759 is an apocalyptic number.

28220759 is a deficient number, since it is larger than the sum of its proper divisors (4031545).

28220759 is an equidigital number, since it uses as much as digits as its factorization.

28220759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4031544.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 28220759 is about 5312.3214322930. The cubic root of 28220759 is about 304.4548498949.

The spelling of 28220759 in words is "twenty-eight million, two hundred twenty thousand, seven hundred fifty-nine".