28581206328 has 48 divisors (see below), whose sum is σ = 77972478480. Its totient is φ = 9457524864.

The previous prime is 28581206233. The next prime is 28581206347. The reversal of 28581206328 is 82360218582.

28581206328 is a `hidden beast` number, since 2 + 8 + 5 + 8 + 1 + 2 + 0 + 632 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1438900 + ... + 1458627.

It is an arithmetic number, because the mean of its divisors is an integer number (1624426635).

Almost surely, 2^28581206328 is an apocalyptic number.

It is an amenable number.

28581206328 is an abundant number, since it is smaller than the sum of its proper divisors (49391272152).

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

28581206328 is a wasteful number, since it uses less digits than its factorization.

28581206328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897676 (or 2897669 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 28581206328 in words is "twenty-eight billion, five hundred eighty-one million, two hundred six thousand, three hundred twenty-eight".