28675304720 has 20 divisors (see below), whose sum is σ = 66670083660. Its totient is φ = 11470121856.

The previous prime is 28675304663. The next prime is 28675304729. The reversal of 28675304720 is 2740357682.

It can be written as a sum of positive squares in 2 ways, for example, as 19950997504 + 8724307216 = 141248^2 + 93404^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28675304729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179220575 + ... + 179220734.

It is an arithmetic number, because the mean of its divisors is an integer number (3333504183).

Almost surely, 2^28675304720 is an apocalyptic number.

28675304720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28675304720 is an abundant number, since it is smaller than the sum of its proper divisors (37994778940).

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

28675304720 is a wasteful number, since it uses less digits than its factorization.

28675304720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358441322 (or 358441316 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 44.

The spelling of 28675304720 in words is "twenty-eight billion, six hundred seventy-five million, three hundred four thousand, seven hundred twenty".