28545779 has 4 divisors (see below), whose sum is σ = 29153184. Its totient is φ = 27938376.

The previous prime is 28545767. The next prime is 28545787. The reversal of 28545779 is 97754582.

It is a happy number.

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 28545779 - 2²⁰ = 27497203 is a prime.

It is a super-2 number, since 2×28545779² = 1629722997433682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 607357 = 28545779 / (2 + 8 + 5 + 4 + 5 + 7 + 7 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28545719) 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, 303632 + ... + 303725.

It is an arithmetic number, because the mean of its divisors is an integer number (7288296).

Almost surely, 2^28545779 is an apocalyptic number.

28545779 is a deficient number, since it is larger than the sum of its proper divisors (607405).

28545779 is an equidigital number, since it uses as much as digits as its factorization.

28545779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607404.

The product of its digits is 705600, while the sum is 47.

The square root of 28545779 is about 5342.8250018132. The cubic root of 28545779 is about 305.6191989425.

It can be divided in two parts, 285 and 45779, that added together give a palindrome (46064).

The spelling of 28545779 in words is "twenty-eight million, five hundred forty-five thousand, seven hundred seventy-nine".