28840104 has 32 divisors (see below), whose sum is σ = 80112000. Its totient is φ = 9613296.

The previous prime is 28840099. The next prime is 28840117. The reversal of 28840104 is 40104882.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 66544 + ... + 66975.

It is an arithmetic number, because the mean of its divisors is an integer number (2503500).

Almost surely, 2^28840104 is an apocalyptic number.

28840104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28840104 is an abundant number, since it is smaller than the sum of its proper divisors (51271896).

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

28840104 is a wasteful number, since it uses less digits than its factorization.

28840104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133534 (or 133524 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28840104 is about 5370.2983157363. The cubic root of 28840104 is about 306.6659850857.

Adding to 28840104 its reverse (40104882), we get a palindrome (68944986).

The spelling of 28840104 in words is "twenty-eight million, eight hundred forty thousand, one hundred four".