28440985 has 8 divisors (see below), whose sum is σ = 34189056. Its totient is φ = 22712880.

The previous prime is 28440961. The next prime is 28440991. The reversal of 28440985 is 58904482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28440985 - 2¹³ = 28432793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1651 + ... + 7720.

It is an arithmetic number, because the mean of its divisors is an integer number (4273632).

Almost surely, 2^28440985 is an apocalyptic number.

It is an amenable number.

28440985 is a deficient number, since it is larger than the sum of its proper divisors (5748071).

28440985 is an equidigital number, since it uses as much as digits as its factorization.

28440985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9983.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 28440985 is about 5333.0090005549. The cubic root of 28440985 is about 305.2447556104.

The spelling of 28440985 in words is "twenty-eight million, four hundred forty thousand, nine hundred eighty-five".