28028813472 has 144 divisors (see below), whose sum is σ = 90733825728. Its totient is φ = 8124272640.

The previous prime is 28028813459. The next prime is 28028813473. The reversal of 28028813472 is 27431882082.

28028813472 is a `hidden beast` number, since 2 + 80 + 28 + 81 + 3 + 472 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×28028813472² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28028813473) 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 23 ways as a sum of consecutive naturals, for example, 119473 + ... + 265200.

It is an arithmetic number, because the mean of its divisors is an integer number (630096012).

Almost surely, 2^28028813472 is an apocalyptic number.

28028813472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28028813472 is an abundant number, since it is smaller than the sum of its proper divisors (62705012256).

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

28028813472 is a wasteful number, since it uses less digits than its factorization.

28028813472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384723 (or 384712 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The spelling of 28028813472 in words is "twenty-eight billion, twenty-eight million, eight hundred thirteen thousand, four hundred seventy-two".