28727680 has 32 divisors (see below), whose sum is σ = 68678640. Its totient is φ = 11490816.

The previous prime is 28727623. The next prime is 28727683. The reversal of 28727680 is 8672782.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28727683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21804 + ... + 23083.

Almost surely, 2^28727680 is an apocalyptic number.

28727680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28727680 is an abundant number, since it is smaller than the sum of its proper divisors (39950960).

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

28727680 is an equidigital number, since it uses as much as digits as its factorization.

28727680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44906 (or 44894 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 28727680 is about 5359.8208925299. The cubic root of 28727680 is about 306.2669861466.

The spelling of 28727680 in words is "twenty-eight million, seven hundred twenty-seven thousand, six hundred eighty".