28385257583881 has 8 divisors (see below), whose sum is σ = 31080000256128. Its totient is φ = 25709559030000.

The previous prime is 28385257583869. The next prime is 28385257583923. The reversal of 28385257583881 is 18838575258382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28385257583881 is a prime.

It is a super-2 number, since 2×28385257583881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28385257583581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4761026470 + ... + 4761032431.

It is an arithmetic number, because the mean of its divisors is an integer number (3885000032016).

Almost surely, 2^{28385257583881} is an apocalyptic number.

It is an amenable number.

28385257583881 is a deficient number, since it is larger than the sum of its proper divisors (2694742672247).

28385257583881 is a wasteful number, since it uses less digits than its factorization.

28385257583881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9522059183.

The product of its digits is 1032192000, while the sum is 73.

The spelling of 28385257583881 in words is "twenty-eight trillion, three hundred eighty-five billion, two hundred fifty-seven million, five hundred eighty-three thousand, eight hundred eighty-one".