28104720 has 80 divisors (see below), whose sum is σ = 99576960. Its totient is φ = 6423552.

The previous prime is 28104701. The next prime is 28104733. The reversal of 28104720 is 2740182.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6685 + ... + 10044.

It is an arithmetic number, because the mean of its divisors is an integer number (1244712).

Almost surely, 2^28104720 is an apocalyptic number.

28104720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28104720 is an abundant number, since it is smaller than the sum of its proper divisors (71472240).

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

28104720 is a wasteful number, since it uses less digits than its factorization.

28104720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16752 (or 16746 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 28104720 is about 5301.3884973656. The cubic root of 28104720 is about 304.0369876510.

The spelling of 28104720 in words is "twenty-eight million, one hundred four thousand, seven hundred twenty".