28355958985 has 8 divisors (see below), whose sum is σ = 34152713856. Its totient is φ = 22601058480.

The previous prime is 28355958977. The next prime is 28355958989. The reversal of 28355958985 is 58985955382.

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

It is not a de Polignac number, because 28355958985 - 2³ = 28355958977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28355958985.

It is not an unprimeable number, because it can be changed into a prime (28355958989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10462099 + ... + 10464808.

It is an arithmetic number, because the mean of its divisors is an integer number (4269089232).

Almost surely, 2^28355958985 is an apocalyptic number.

It is an amenable number.

28355958985 is a deficient number, since it is larger than the sum of its proper divisors (5796754871).

28355958985 is a wasteful number, since it uses less digits than its factorization.

28355958985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20927183.

The product of its digits is 155520000, while the sum is 67.

The spelling of 28355958985 in words is "twenty-eight billion, three hundred fifty-five million, nine hundred fifty-eight thousand, nine hundred eighty-five".