28409898564 has 72 divisors (see below), whose sum is σ = 72199999872. Its totient is φ = 9419172480.

The previous prime is 28409898533. The next prime is 28409898593. The reversal of 28409898564 is 46589890482.

28409898564 is a `hidden beast` number, since 28 + 40 + 9 + 8 + 9 + 8 + 564 = 666.

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 23 ways as a sum of consecutive naturals, for example, 7203177 + ... + 7207119.

It is an arithmetic number, because the mean of its divisors is an integer number (1002777776).

Almost surely, 2^28409898564 is an apocalyptic number.

It is an amenable number.

28409898564 is an abundant number, since it is smaller than the sum of its proper divisors (43790101308).

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

28409898564 is a wasteful number, since it uses less digits than its factorization.

28409898564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4977 (or 4972 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 63.

The spelling of 28409898564 in words is "twenty-eight billion, four hundred nine million, eight hundred ninety-eight thousand, five hundred sixty-four".