28418985 has 128 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 11612160.

The previous prime is 28418969. The next prime is 28418989. The reversal of 28418985 is 58981482.

It is a happy number.

It is not a de Polignac number, because 28418985 - 2⁴ = 28418969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (184320) is a multiple of the sum of its prime factors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 28418985.

It is not an unprimeable number, because it can be changed into a prime (28418989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 465855 + ... + 465915.

It is an arithmetic number, because the mean of its divisors is an integer number (502200).

Almost surely, 2^28418985 is an apocalyptic number.

It is an amenable number.

28418985 is an abundant number, since it is smaller than the sum of its proper divisors (35862615).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28418985 is a wasteful number, since it uses less digits than its factorization.

28418985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 122 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 28418985 is about 5330.9459760909. The cubic root of 28418985 is about 305.1660298222.

It can be divided in two parts, 28418 and 985, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 28418985 in words is "twenty-eight million, four hundred eighteen thousand, nine hundred eighty-five".