28440355 has 4 divisors (see below), whose sum is σ = 34128432. Its totient is φ = 22752280.

The previous prime is 28440353. The next prime is 28440367. The reversal of 28440355 is 55304482.

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

It is not a de Polignac number, because 28440355 - 2¹ = 28440353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28440353) 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, 2844031 + ... + 2844040.

It is an arithmetic number, because the mean of its divisors is an integer number (8532108).

Almost surely, 2^28440355 is an apocalyptic number.

28440355 is a deficient number, since it is larger than the sum of its proper divisors (5688077).

28440355 is an equidigital number, since it uses as much as digits as its factorization.

28440355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5688076.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 28440355 is about 5332.9499341359. The cubic root of 28440355 is about 305.2425017549.

The spelling of 28440355 in words is "twenty-eight million, four hundred forty thousand, three hundred fifty-five".