28171854977 has 8 divisors (see below), whose sum is σ = 32198416896. Its totient is φ = 24145795872.

The previous prime is 28171854973. The next prime is 28171854979. The reversal of 28171854977 is 77945817182.

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 28171854977 - 2² = 28171854973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28171854973) 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, 3173 + ... + 237389.

It is an arithmetic number, because the mean of its divisors is an integer number (4024802112).

Almost surely, 2^28171854977 is an apocalyptic number.

It is an amenable number.

28171854977 is a deficient number, since it is larger than the sum of its proper divisors (4026561919).

28171854977 is a wasteful number, since it uses less digits than its factorization.

28171854977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251407.

The product of its digits is 7902720, while the sum is 59.

The spelling of 28171854977 in words is "twenty-eight billion, one hundred seventy-one million, eight hundred fifty-four thousand, nine hundred seventy-seven".