28519257985 has 8 divisors (see below), whose sum is σ = 34225513920. Its totient is φ = 22813803504.

The previous prime is 28519257983. The next prime is 28519258003. The reversal of 28519257985 is 58975291582.

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

It is a cyclic number.

It is not a de Polignac number, because 28519257985 - 2¹ = 28519257983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28519257983) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 119077 + ... + 266866.

It is an arithmetic number, because the mean of its divisors is an integer number (4278189240).

Almost surely, 2^28519257985 is an apocalyptic number.

It is an amenable number.

28519257985 is a deficient number, since it is larger than the sum of its proper divisors (5706255935).

28519257985 is a wasteful number, since it uses less digits than its factorization.

28519257985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400727.

The product of its digits is 18144000, while the sum is 61.

The spelling of 28519257985 in words is "twenty-eight billion, five hundred nineteen million, two hundred fifty-seven thousand, nine hundred eighty-five".