28006480 has 40 divisors (see below), whose sum is σ = 68948712. Its totient is φ = 10543104.

The previous prime is 28006477. The next prime is 28006493. The reversal of 28006480 is 8460082.

It can be written as a sum of positive squares in 4 ways, for example, as 13808656 + 14197824 = 3716^2 + 3768^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8937 + ... + 11656.

Almost surely, 2^28006480 is an apocalyptic number.

28006480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28006480 is an abundant number, since it is smaller than the sum of its proper divisors (40942232).

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

28006480 is a wasteful number, since it uses less digits than its factorization.

28006480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20623 (or 20617 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 28006480 is about 5292.1148891535. The cubic root of 28006480 is about 303.6823204956.

The spelling of 28006480 in words is "twenty-eight million, six thousand, four hundred eighty".