28344977 has 4 divisors (see below), whose sum is σ = 29322420. Its totient is φ = 27367536.

The previous prime is 28344961. The next prime is 28344989. The reversal of 28344977 is 77944382.

It is a Cunningham number, because it is equal to 5324²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14868736 + 13476241 = 3856^2 + 3671^2 .

It is a cyclic number.

It is not a de Polignac number, because 28344977 - 2⁴ = 28344961 is a prime.

It is a super-2 number, since 2×28344977² = 1606875442261058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28344907) 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, 488678 + ... + 488735.

It is an arithmetic number, because the mean of its divisors is an integer number (7330605).

Almost surely, 2^28344977 is an apocalyptic number.

It is an amenable number.

28344977 is a deficient number, since it is larger than the sum of its proper divisors (977443).

28344977 is an equidigital number, since it uses as much as digits as its factorization.

28344977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977442.

The product of its digits is 338688, while the sum is 44.

The square root of 28344977 is about 5324.0000939143. Note that the first 4 decimals coincide. The cubic root of 28344977 is about 304.9008976602.

The spelling of 28344977 in words is "twenty-eight million, three hundred forty-four thousand, nine hundred seventy-seven".