28185239655 has 32 divisors (see below), whose sum is σ = 50148357120. Its totient is φ = 15019748640.

The previous prime is 28185239633. The next prime is 28185239659. The reversal of 28185239655 is 55693258182.

It is a happy number.

28185239655 is a `hidden beast` number, since 28 + 1 + 8 + 523 + 96 + 5 + 5 = 666.

It is not a de Polignac number, because 28185239655 - 2⁹ = 28185239143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28185239659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79750 + ... + 250460.

It is an arithmetic number, because the mean of its divisors is an integer number (1567136160).

Almost surely, 2^28185239655 is an apocalyptic number.

28185239655 is a deficient number, since it is larger than the sum of its proper divisors (21963117465).

28185239655 is a wasteful number, since it uses less digits than its factorization.

28185239655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171948 (or 171942 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 54.

The spelling of 28185239655 in words is "twenty-eight billion, one hundred eighty-five million, two hundred thirty-nine thousand, six hundred fifty-five".